Electric feed for Power Shower?

I need to get an electric feed to my bathroom for my Power Shower (Mira event XS Thermostatic) and do not really know where to start. Do i take a feed from a socket then to a little fused box then to the shower? and what size cable do i need? and where would it best to fit the fused box? and what size fuse should it be? If anyone could help i\\\'d be really grateful.
Ollie.

Use a socket on the ring, spur off in 2.5 to a FCU fitted with 3AMP fuse, and then to the shower in 1 or 1.5mm, FCU best at ceiling height just outside the bathroom door if the shower is wall mounted, next to the pump in the airing cupbaord if it is in there, etc, make it a switched FCU for isolation purposes.

Oh, and if the electrical part is in the bathroom... part P notification is needed, and it'll need to be included in your sup bonding.

P.S. First paragraph assumes that it is indeed a power shower(pumps water from CH system), and not an electric shower (takes cold water, heats it), if its an electric shower, then things are different as they are power hungry devices and need a dedicated circuit

Thanks alot! thats really helpful! yes it is a power shower, the plumper says the feed is only needed to go to shower to power the inbuilt pump.
Thanks again