Well after much deliberation I have gone a bought a Ryobi. 150W, variable rpm (10K - 30K). Came with a bench clamp and flex shaft plus 115 accessories. And the collet size is industry standard so can use attachments of pretty much any make. All for the bargain price of £43 (15% discount at B&Q). Similar spec Dremmel was £110. Very happy bunny

Thanks to everyone for their advice. I was hugely appreciated.
Sean