5mm is fine for most of the year. I spear on the south coast (Brighton). Some use a 7mm jacket at the beginning of the year with 5mm trousers, then progress to 5mm top and bottom reducing down to 3mm trousers in the summer with a 5mm top. Open cell is warmer and dries faster out of the water (if you are diving from a boat) causing less cooling by wind action (evaporation). Consider an open cell top and nylon outer trousers. (Tougher, less prone to rip) A good tailor-made Like an Elios is not that much more than an 'off the peg' and cheaper in some cases. A good fit is essential to prevent 'flushing' of cold water. I prefer trousers to long johns which always make me feel like I cannot breath.
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