My son is in reception and so far they have had 2 school trips with a 3rd coming up soon. Each one has been a 100 mile round trip on a coach on the motorway. I have asked each time if I can go along as a helper and have been turned down each time. I gave my son a choice of going on the trips and he said he didn't want to go. I know I could have easily pursuaded him but chose not to as I didn't think the trips were a good idea myself. The third one is coming up and I'm being pressured by his teacher to send him. Am I being unreasonable to keep him home?