DDs primary school has sent out a letter advising of a considerable hike in the cost of this year's residential trip (one overnight), they are asking for a "voluntary contribution" of in the region of £80. Last years cost about £50. I think they will be doing things at an activity centre which they didn't use to do, so it is hard to compare like with like - so I am wondering, is £80 or so way out of line, or are other primary schools asking for similar amounts? Thanks!