Popped into Homebase this afternoon and spotted these.
Very strong hardwood castor dollies at just over £5.50 each. Just the job for standing my Tannoy Cheviots on after a lick of black paint. I may remove the carpet pads.
They measure 18" by 11 1/2" and raise the speaker just over 5" (and for those of you who don't do Imperial measurements -- tough! )
Anybody interested in some should be quick, as they are a 'special' with very limited stock.