I have recently moved into a new home and was looking to have a electric shower fitted who do i get in first the plumber or the sparkie and also should i get it tiled befor the shower is fitted...?

depends where the cable and pipe need to come from.
if in from the rear of the wall not a problem but if it needs to come
from above and routed in the wall then the pipe/cable need to be done first.
then it can be tiled.

some plumbers will be able to do all 3, plumb,elecy,tiling