GJW Models on ebay, selling emergency services decals in 1/76th scale:
http://stores.ebay.co.uk/GJW-Models/Emergency-Services-Decals-1-76-/_i.html?_fsub=2555465017&_sid=1054917187&_trksid=p4634.c0.m322
All sorts of whiffy applications, and I sure various people on here will be interested.
The rest of their web shop is worth a look too: good range of small scale vehicles and armour.
They look to be the same decals offered by BW Models:
http://www.bwmodels.co.uk/index.asp?pageid=296099