To save me having to stress the grey matter has anyone got any figures on the breakdown where small/medium sized an fairly simple moulds cnc,d in Ali are cost affective over tooling block/carbon moulds

Rough mental arithmetic looks like 25plus parts would make the Ali more cost effective

Anyone ??????

nope

a 1500mm x 650mm x 50mm sheet of epoxy block is roughly 3-400quid and the equivalent in ali would be a few grand at least.