Facet red top pump

Has anyone in the UK got one that doesn't work anymore?
I'm looking for a part that flew out on the end of a spring and has disappeared into thin air !
the valve on the left has a minute spring and retaining clip holding the plastic valve in place...the right one doesn't (see pic)
I really don't want to have to buy a whole new pump and I can't find anywhere that sells facet parts

Panic over. Found the retainer and managed to use a biro spring to give the same amount of tension!