Quick update. had machine for a few days now, couple of problems, the Z axis dropped out on a few occasions on the first day (just stopped working mid cycle) and today on a 14mm profile cut with 1mm deep increments, it stopped about half way thru whilst the rest of the machine carried on. Mach 3 continued to show the Z axis getting deeper so I knew it was a cable or driver issue. Lucky for me, I was watching it when it failed as it would have smashed the tool when the cut was finished as it would have left the slot without extracting the tool at the end of a 15 minute cycle.
Traced it to a broken wire in the Z axis cable and replaced a 10 inch section of the whole 4 wire cable, machine is now working very well. Accuracy is fantastic and I'm really getting on with Cambam. (thanks to you guys for reccommending it)
I expected teething troubles and have had them but the machine is brilliant and apart from the cable issue and a squeak on the x axis it is hard to fault.
I made a sacrificial MDF bed for it on the machine itself and as I'm going to be machining mostly Ply/CF and thin sheet Aluminium I will simply use double sided tape to stick parts to it. Tried this already to machine a few parts and it is totally secure.
Anyhow, thanks to all who offered help and advice, I will be only too happy to reciprocate as my knowledge grows.
Al