Just to pre-empt me starting a ranty thread next week...
I rarely travel by train, but have booked a 2 and a half hour journey next weekend.
After reading threads on here, I also reserved seats .
Leaving London, it's unlikely I'll have a problem with seat squatters.
The return journey involves changing trains, so I'll be getting on to an already busy train.
What should I do if there is someone in my seat?