From what I understand the cost comes down to the type of flowers you use. I spoke to one florist who said she uses loads of cow parsley when it is in season to bulk up arrangements for free! I assumed she was talking about the pedestals though, not the bouquet! Other than that the quotes I have had have been similar - I live in Oxfordshire too! Were you at the Wedding Fair in Abingdon on Sunday? There were 3 florists there and the one next to the chocolate bars (can't remember her name!) was really nice.