It's interesting how many strings Britain was able to pull to get advantages in the Falklands War. It also was reported [0] that Thatcher convinced the French to hand over IFF codes that would effectively prevent Argentina's French-made Exocet missiles from targeting British ships. The war might have gone very differently if Argentina was the one with powerful diplomatic connections.

Yes, both France and the Netherlands are broadly aligned with the UK, and would fight alongside them in the case of any existential threat. But for colonial wars one might think they'd be happy to see Britain get some egg on her face.

[0] I'll just link to skeptics.se here, where the accepted answer is that the evidence does not completely support this, but there are plenty of links for more reading https://skeptics.stackexchange.com/questions/11152/can-exoce...