Doh! I've finally succumbed and bought some
28mm Plastics. I've been fighting the urge for a while, but they are now so cheap (30p a figure??) and there are enough ranges to allow you to morph them into different armies (Auxilia + Vikings = Sub Roman Brits anyone?).
Have a look here at what's for sale on eBay UK or
look here for US listings. The Warlord Games ECW stuff
is available to see here