Vauxhall Astra engine cuts out after 10 minutes nofuel pump pump works by bridging relay.

That relay is pulled to earth to operate via the ecu so either that's faulty,the wireing between or the ecu earth,check that first.but ten minutes is pretty specific so I'd suspect the ecu.there's a product used in the electronics industry,freezospray or similar,get it in maplins,anyway it freezes anything it's sprayed on,buy it,spray it on the ecu when it's playing up and when the frost forms test it,if the car starts the faults in the ecu and is heat current related.