I make a list of things I want to see in person before I buy and make it a point to see those things. I keep a list of booths I may want to go back & take a closer look at something & what that something was at what price. You may find the perfect rotary cutter 12 booths down and around the corner for much less. Example being a Brooklyn Revolver cutting mat compared to a Clover or Omnigrid (I can't remember which brand I have.) One year, in Paducah, there was a line of people waiting to pay $80 for the Brooklyn Revolver cutting mat but a few booths down they had a different brand for half that.
Since you're in England, I would pay particular attention to anything on my dream list that has to be shipped in from other countries. You could save a bundle on shipping, taxes &/or duties.