How old are your kids? We have been to cornwall the past 2 years and the wet suits and body boards for little kids are fairly cheap to buy. I have even seen small wet suits in Home Bargains shops. So if you have one near you it might be worth checking it out. If your kids are older though they may want the better gear. You know what teenagers are like with labels and names. Hope you have a fab time, I love Cornwall. We will be going back next year. Where are you staying?