Thanks for the link Champions_2002
It was nice hearing from Dave Munsie himself, however non of the links in the thread led me to the games I am seeking and the thread is over a year old, so it looks like he has vanished again from the ST scene.
Dave Munsie also said in the thread he released Deluxe Invaders
for the Atari ST, this is another one I can't seem to find. Again any help on this game would be very welcome.
Many thanks for the information on the Dave Munsie compilation, i have now added that also to GamebaseST.