I need a the little white plastic bleed screw from a mk1, i awsume there probably the same on most mk's.

Its the one that has a wing top and screws into the heater.

if mk1 is same as mk 2

then vw still mkae and sell this part

there should be a part number on it

it cost me somehting silly like 47p + vat

If not I have one attached to a full heater matrix from a late mk1.

Cool, i'll go and check with my unhelpful VW dealer and if no luck i'll give you a shout charlie :-)

Got one for £2.49 from VW :)