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in The potting shed
Alan, read this advice from the RHS:
Basically if you choose a self-fertile one like Sunburst which is grafted onto a dwarfing rootstock like Gisela 5, you can grow it as a fan against a south-facing fence or wall, but they grow too big for espalier or cordon training. As you are in Pembrokshire the Gulf stream should keep your area warm enough as sweet cherries don't grow well in northern UK climes.