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Sorry - I didn't make it very clear... The trunking in the picture is just an example of what's been used on the ceiling to carry the cable from the light fitting in the centre of the ceiling to where the wall/ceiling meet.
You wouldn't need a plumber to box in either though would you?
To be honest I'd probably have a good crack at it myself but worth knowing what it might cost if I chose not to/messes it up...if anyone could give a rough idea?
Quincy-
If you have no access from above you need to know if the construction of the ceiling/floor is wooden joists or something more solid. The age of the building should tell you this. If it's joists you can get the cable under the wall/ceiling but not without disturbing the wallpaper. It depends on the direction of the joists how hard/easy the job will be. It could easily cost you a days money for an electrician and then the making good which takes a small amount of work over a number of days to allow drying times.
You are not allowed to simply notch out under joists so you need fairly large holes in the ceiling to get a drill in to cut a hole in the joist. In short the whole job is a pain in the ass, it's a lot of fuss for little practical advantage but once you've done it you feel better for the rest of your stay. Fixing the problems you've got there could easily cost £2k, long runs of well made boxing for the plumbing is not trivial.
Airhead
Considering plumbers are usually about 40-60 quid an hour I think you'd be looking at a lot more than 100 quid per room.
Electrics wise, you could pull off the skirting boards and replace them with ones that are designed to hide wires then you'd have a lot less on show...