Thanks Des,
Well ....
The failed secondary pump is definitely stuck fast and no amount of "taps" will free it up.
However, the new boxed pump became operative after a couple of gentle taps and seems to work now each time I apply power.
My plan is to fit the new old stock pump in place of the one originally fitted and try in for a couple of seconds from time to time as this is the "boost" pump on the Europa and the backup fuel pump. It is a top quality german pump, so I think it is probably OK.
Thank you for your help
Regards
Trevor