eBay got to me again.... picked up a brand new Dewalt D28885 500W 1.7kg die grinder as the basis for my milling spindle for £40, bit cheaper than the £100 asking price for a 500W Kress. There are a couple of places on the Net doing spares for the Dewalt and they list the spindle bearings as type/size 608VV so should be possible to upgrade them later if need be...

Still havent decided if this is going to be a fixed or moving gantry machine... I'm tending towards fixed gantry, moving table in X, moving spindle in Y & Z