If you are using products by F. Ball (no matter where you bought it as long as you have the invoice) you should register for F. Ball's contractor Loyalty (and rewards) Card. Go here: http://www.f-ballrewards.co.uk/ and register. Then download their cash-back forms and make copies of your invoices. If you register before 30.06.10 you can claim back cash on all F.Ball purchases in May and June. (And if you have already registered - before 30.04.10 - you can still do the same for purchases in March and April). Depending of course on how many F.Ball products you use you could at least treat yourself to a (free) pint ;-)
I registered several months ago but haven't claimed anything - just don't have time to go through all my invoices and copy them and whatnot. I've not had a huge amount of their stuff recently though. Apart from a couple of pallets of screed. And 12 tins of F60. And half a dozen F44's. Bugger. I did manage to do the altro cashback thing this time around, no sign of my money yet though....
If you'd registered before 30-04-10 you could still claim the cash back on purchases of March and April. 10 minutes work to get a free pint (one at least ;-))