In the applecart upsetting calculation, don't forget that Eurocopter UK is based in rather close proximity to the constituency of the Rt Hon David William Donald Cameron MP PC.
PM's interefere over defence projects in neighbouring constituencies? Never happ... hang on....
Granted, it's in the next door constituency, but it is a Tory marginal with a majority of 176 and fairly important if DC is going to aspire to getting a parliamentary majority at the next election.