billythekid
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dont panic!! lol
all you really need is a good stable level flat base for the shower tray, unless the manufacterers state differently. if its bedded down well and level you will have no trouble. the 18mm ply should do fine, especially if you strengthen the joists, 22mm would be preferable, but not "necessary"(waits for contradictory replies).
An inspection is not required either, well not for inspecting it! lol just for the fitting you will need a way of getting your waste pipework all connected up to the trap.
btk
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