Mine was in a bad way and I restored it. At first I was going to re shell it but allways nicer to repair the original shell well top half is original bottom section is all new. This mini above 25 years ago it was probably the cheapest easiest and quickest option to re shell it. these days now every piece of metal that can be saved that is original is worth repairing. I have just brought another mk1 mini a 1960 someone brought it stripped all the good parts of it and then sold the rolling shell on to who I brought it of. Now this will leave me with original shell heritage certificate original logbook and tags on body shell I have no original engine seats clocks etc I will have to find all this but it won't be original to the shell does this make my 1960 a turnip?
I think its fair to see the shell as the main part of the car Tom, subframes and engines all have a life span that was designed not to be around as long as we have let these little cars remain on the road for, as new replacements for everything other than a mk1 shell is available new or reconditioned with a VAT receipt I have no problem with that at all 
Under the DVLA points system the original Mk1 Shell is not enough on its own and if you declare the fact that the other parts fitted (that score points) like the subframes are new or secondhand you will be issued with a Q plate if they don't add up to 8 points........why anyone would actually declare that fact to the DVLA and invite them to inspect their car I'm not sure, when many 'original' Minis would have had some or all of these items replaced over the last 50 years anyway, most monocoque construction cars like the Mini don't have any dateable serial numbers stamped into many of the various points scoring items listed by the DVLA rule book below. No one has ever been able to explain to me how a DVLA inspector will confirm that your subframes, steering assembly, axles, etc are new or secondhand replacement items and not the restored originals.......perhaps they use Radiocarbon dating techniques as used in Archaeology!
Therefore I agree with CityEPete.....Tom if you have the original Mk1 shell no problem in the real world...unless you really feel the need to ask for the extra excitement of an official inspection! 
The DVLA uses a points system to decide what registration number to give a radically altered vehicle:-
To keep the original registration number
Your vehicle must have 8 or more points from the table below if you want to keep the original registration number.
5 of these points must come from having the original or new and unmodified chassis, monocoque bodyshell or frame.
Part Points:
Chassis, monocoque bodyshell (body and chassis as one unit) or frame - original or new and unmodified (direct from manufacturer) 5
Suspension (front and back) - original 2
Axles (both) - original 2
Transmission - original 2
Steering assembly - original 2
Engine - original 1
Get a ‘Q’ registration number
You won’t be able to keep your vehicle’s original registration number if one of the following applies:
- it has fewer than 8 points
- it has a second-hand or altered chassis, monocoque bodyshell or frame
- there’s evidence that 2 vehicles have been welded together to form one (ie ‘cut and shut’)
Your vehicle must pass the relevant type approval test to get a ‘Q’ prefix registration number.
https://www.gov.uk/v...ltered-vehicles
Edited by mab01uk, 29 December 2014 - 07:56 PM.