Hi Simon,
5mm is the way to go Ithink, we have similar water temps and 5mm open cell or smooth skin is fine for hours at a time. The only part of me that usually gets cold first is my feet with 3mm socks. If you are diving to 30m in a 7mm prepare to go deeper in 5mm. I would struggle to get anywhere near that in a 7mm. Also my cressi or Elios freediving 5mms are just as warm as my 7mm scuba suit used to be.
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