Possible Clues:

• Associated with two parties, oil company worker adopts one
• Relative's entry into Britain's surprisingly supported by Labour and Tories?
• Involving the agreement of two parties
• Politically co-operative oil company retaining current skilled worker
• Major cut to obsolete weapon, with political co-operation
• Power within Britain as reorganised between political groups
• Contract offer is blindly loyal to one side in agreement involving more than one party
• With two-party support
• Bishop engaging one craftsman involved with two parties
• Nasty spat in bar, one involving two political groups