[quote="plumbbob"]Combi boilers are high pressure and a mixer shower should work great providing you have good mains water connection. These type of showers can be connected directly to the feeds under the bath.[/quote]
If you are using a shower head that is loose, make sure you add double check valves in line on the pipe work to the shower somewhere to keep up to date with the current water regs regarding water contamination. If you are installing a rigid shower (one that is permanently fixed) then you don’t need to add the check valves.
Oh and for servicing convenience, I would suggest adding a couple of isolation valves under the bath to make servicing a bit easier.
All of those things will only cost a couple of quid.
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