Hi Louise, 1 - Most charge a daily rate. Anything from £100 to £250 per day. Really depends on a lot of factors like experience, location etc. 2 - smaller radiators may be cheaper to buy but the extra work of moving pipes could put the price over that of larger ones that don't need pipes adjusting. 3 - Yes it will cost more to relocate the radiators. The more work for the plumber the more he'll charge. Plus the cost of new pipes. 4 - Yes it makes much more sense to get radiators done while floorboards are up. Less work for the plumber the less he'll charge. 5 - Radiator heat output is measured in BTUs(British Thermal Units). Generally the more water a radiator can hold the greater it's heat output. Bigger/thicker radiators hold more water so output more heat. There are many online BTU calculators that can help you figure out what size of radiator is best for each room in your house. An experienced plumber will also be able to help when choosing the right size radiator.

Such a talking point! A couple of thoughts on other options…. You could try sticking vinyl peel & stick removable wallpaper right on top of the Perspex. I have NuWallpaper in my kitchen as a temporary measure and think it would withstand your bath area just fine. It’s inexpensive and DIY. You aren’t likely to match the existing tile, but you could tile the area in a complementary colour. You could also create a design that incorporates other similar white tiles to tie it all together.

Are you asking for recommendations in your area to replace them? Many such companies post on their local town FB for these jobs. I would take a look on there. I do have a company recommendation but they are Tamworth based in Staffordshire and don’t work too far out of the area? Are you close to that area?

Hi Joyce, Looks like the wallpaper has more reds & blues in it, so if you are after a pink feature try and pink a paint with a red hue in it. https://coatpaints.com/products/mrs-bouquet-flat-matt Mrs Bouquet could work (and you could also carry the colour onto the ceiling for a little more impact) Alternatively a strong blue could be quite nice https://www.farrow-ball.com/paint-colours/stiffkey-blue  Or you could just paint the wall same colour as the remaining walls + add art above?