s1 IMO. Non customs are very rare.. i used to have one of these.
As most people have said.. for £1500 i'd expect it to be a right dog.
I had one of mine restored a couple of years ago, and with a 110k mile 200 odd bhp engine that sold for over 4 grand, and in all honest that was cheap for what it was imo.
1600i also seems cheap at the price as these are very rare too.