You could use a 105vA transformer though. Just ensure the lights aren't tooooo far from it, or you'll have a problem with voltage drop, which will affect the brightness of your lights
Also, selecting the correct size transormer is only a very small part of the work you need to do to meet the 'safety regulations', by which I assume you mean BS7671 17th Ed. Wiring regs and applicable building regs.
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