Parents Required on School Trip

[IndigoBell]

I'm reviewing school policy, and want to know whether it's legal to say that if school feel they can't keep a child safe without their parent there, then they won't be allowed on a school trip.

ie school has done a health and safety assessment, and think that even if they assign a TA 1:1 to a child they still present a danger (won't follow instructions immediately for a TA or will run off), and so they require a parent to come else the child can't go.

Is this legal?

What if a parent can't go on a school trip?

If the child is unable to travel by tube could another method of transport be used e.g. taxi and would the parents be willing to pay for this ?
In my experience governors are not told the names of particular children butt hey may say " a child in YX or with ......... condition".
I have been on my child's school trips to administer her medication but was also able to help supervise other children in a small group as well. I have been happy to do this as I did agree and sign a form to the effect "if a suitable member of staff is not available to give medication then the parent agrees to do this".