Increase or worst case neutral I think, because none of the police modifications make any function of the car unusable (assuming it doesn't have lights or anything that stop you driving on public roads).

For example, when I was looking at a fire truck, I wanted it so much, but it wasn't usable with a 850 engine. And in a vehicle that unique I just couldn't do any engine changes. So for me, that modification actually decreased the value. But, for someone who didn't care so much about the history they could have just paid normal price and thrown away the fire truck stuff in the back and upgraded the engine. So I think in the end the uniqueness was value neutral. 

For cop car...how much more? Can't answer that. Depends how much someone is willing to pay. Could be a lot, could be almost nothing.

I think a Cooper S police car should be viewed and remain as it was originally speced. Just like a factory racecar, it's glory and history should be celebrated.

Like Cheleker, I am getting closer to selling my '71 ex-Liverpool Police Cooper 'S'. Yes they are 'S's, but how do those on this side of the pond view a car restored to police spec. Does it increase the value or decrease it or? And, how does the current financial climate effect the value of any Minis? So many unknowns for a unique car. Randy

This truck looks like your cup of tea right? Maybe you could make a trade?


https://sfbay.craigslist.org/nby/cto/d/petaluma-1963-austin-mini-rover-truck/7183054353.html

Getting ready to sell my '68 Cooper S Liverpool Cop Car. Looks like I should review what it should sell it for!

Surprised this one didn't get linked here:

https://www.ebay.com/itm/1964-Austin-Mini-Cooper-S-/324264988078?_trksid=p2047675.l2557&ssPageName=STRK%3AMEBIDX%3AIT&nma=true&si=VDo%252FY3hMHJb%252BmgzO7Ce6dW6qfQc%253D&orig_cvip=true&nordt=true&rt=nc

Sometimes I wish I was in the 1990s.....

https://www.msn.com/en-us/autos/enthusiasts/1964-classic-austin-mini-cooper-s-clone-brings-35-000/ar-BB18oOrY?li=BBnb4R5&ocid=mailsignout#image=BB18p4P5|15