I'd say that's an older than 67 shell of a mainstream Mini....not S or Cooper

Thank you all so much for the replies! The level of knowledge here is astounding. 
The car is currently in storage. When I get my hands on it and back home, I'll have lots of homework to do to in identifying it.
I'm coming to the conclusion its not an original S, but as one poster said, it was my Dad's car and its worth getting running for sentimental reasons alone.
I'll keep you all posted here - I'm leaning towards tackling this myself in my garage as a long term project. 

The carbs and exhaust manifold are aftermarket items. What is the casting number at the top right (under the rocker cover) of the head they're attached to?? Any pictures of the engine block (esp the back and top).

I can see a set of non S rockers in the parts box.

As suggested by others, look for evidence of the boot board supports (rivets holes in the appropriate places). If the front is original (even if it is removable) you might find the original body number plate under the paint on the top of the slam panel about a hand span in from the left (as you look at the front). The body number can be used to get a Heritage Certificate.

Does the shift hole look neat and regularly shaped? Holes in the rear subframe for the electric pump that would have lived there?

Unfortunately there isn't really much to identify an S body when pretty much everything is missing.... Good luck.

Depending on the state of the floors and sills there may be not toooo much effort involved in getting you Dad's car back to life.... and who says it has to be stripped of its history and turned into another bland "restoration" ;)

Cheers, Ian

Seeing as how the mini was a rally car the odds of it having original anything on it are pretty slim. I would not expect the oil cooler to indicate more than it has an oil cooler still attached to it. The rear lights have most certainly been cut out and as previously stated it was common years ago to do that to make your mini look like an mk2. I have a 63 that has had the same thing done. Dating the mini will be dificult but there are several ways that might give you an idea. Maybe. As for it being a Cooper or Cooper S I would lean towards saying no. I could be wrong. Cooper minis had pop out rear quarter windows that used "piano" type hinges. Look to see if there are 5 (I believe) little holes in the frame opening of the rear side windows where the hinges would have screwed to the body. This wont tell you if it was a cooper but it will tell you if it wasnt. If you can open the boot (trunk) there might be evidence of brackets for a boot board. Coopers had them standard minis did not. Also if there is a latch still remaining in the boot lid itself it should have a date stamp. Again who knows if the boot is original. You can narrow down the age of the shell itself depending on upon the seatbelt anchorages in the door pillars. they will either be up high near the top of the window or noticabley lower. The anchorages were lowered in mid 1963. The engine inside the mini is a thick flange block and not original to an early mini. What I find truly amazing with the mini is how nice and I mean nice the left door fits. Very few minis with external hinges have doors that fit like that. I wish a couple of mine looked that good. Because of this I would like to think the door/doors are probably original. The doors have the early style window channels with several holes for the window latches. In aprox may 1963 those were changed to only having a few holes. It is and will be very diificult to figure out what year the mini is and like I started out saying it is highly likely a lot of the parts on the mini have been swapped as often times thats what happens in a rally car. As for it being worth restoring.... I think you will find most people will tell you no unless its a Cooper S. Problem here is that it probably isnt and it is missing all the stuff that makes the S special. However it is your dads old rally car and that is quite possibly reason enough to make sure it does not get scrapped.

I see early (1963 and older?) window latch locking trim on both doors. The horizontal trim with a series of small holes running the length of the door window openings. As already mentioned the door trim fastener holes are also missing. If these doors are original to the body shell it did not leave the factory as a Cooper S.

The Mini still has value. I recommend posting some good photos of the engine block (front and back), cylinder head (from the top look for a casting number) and transmission (front finned area, again looking for a casting number). Some of these parts can add value to your car.

Correct brake master cylinder but no signs of trims around door windows or the holes where they would have been.

For those: Early Cooper Ss had a vertical cooler, not horizontal behind the grill but near the radiator. Also not all Cooper Ss where wet suspension

A 67 S would also have had a right hand tank. No sign of a hole for it.
Bruce.

The body is a 67 or earlier shell. The rear window opening is the same as the boot opening, but someone cut the taillight openings for a mark 2 housings. In those days it was common to make a mark 1 look like a mark 2, by  putting the mark 2 front badge (which you have) and  taillights. The door handle is of an earlier mini. There are no buttons for the chrome surround that a Cooper would have. As mentioned the oil cooler is not Cooper "s'. Should have had wet suspension but was changed to dry suspension.

I can't tell you if it's an "S" or not, but what I can tell you is fixing that car is going to be a huge undertaking, especially if you want it to go back stock. It's the perfect car for a modified build. That being said, the no VIN or paperwork would worry me more than anything. Don't know where you are, but paperwork issues are hard to overcome sometimes.

The first picture creates an issue. The oil cooler is bigger (higher) than a standard S oil cooler and in a legitimate S it is located exactly in the center of the grill opening. An S motor has 11 holes for mounting studs with 2 extra holes on the ends. Your car looks too far gone to me even if it is an S. 

Hello, new poster here.
I have inherited my Dad's rallycar. I believe it to be a '67 Austin Cooper S, however it has no papers or logbook. The Vin plate has also been cut off it, making it extremely difficult to identify for me to get a replacement logbook.  My Dad rallied it in the 70s and 80s but has laid idle in his garage the last 30 years.

The car is in really poor shape, so I would appreciate people's advice on whether it's worth restoring or not. If it's a real Austin Cooper, then I would be prepared to fully restore. I fear it may be a standard mini with race bits added however.

I have read the "identify your mini post" and it seems to have the external door hinges, HS2 carburettor and three into one exhaust manifold but after that it would need a keener eye.  I've attached some photos. Appreciate any and all advice!

https://ibb.co/VLgW6Jt

https://ibb.co/qR4tbMP

https://ibb.co/rwBgfVt

https://ibb.co/qdgWGVm

https://ibb.co/HFLcywG

https://ibb.co/c80Bsqf

https://ibb.co/XkkYCNn

https://ibb.co/19fhQvq