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Will be ok till you stub your toe on the edge of the tile some night about 4am. Could work for most people if it's only sitting a short while but with your track record how long till the other bit gets finished.

No, they don't; only the higher flow ones, typically. You have to plan out the runs carefully because the pipes running into manifolds end up like Clapham Junction, and you want to order them whenever practical to avoid cross-overs.

Leave extra in length so its easier to join both ends up. Have it sitting on a stand like the spark would have a reel of cable so it's easy to pull. Make sure where the ducts are going they will fit, no toliet pipes etc in the way, before you start. Have you checked that the actual main unit will fit where you want it to go and have enough room to get at it for changing the filters.

Hmmm. Different factors. I'd say that up to about 450x450 are probably OK before some people may struggle, but if you get really big ones that are difficult just for manual handling for you, then you will have problems laying them - and be more restricted in cutting. A 600mm x 600mm porcelain floor tile could weigh the best part of 10kg. And they come in up to 900x900 iirc. Imagine trying to cut that with a power cutter or just leaning over to lay it down. Also, breaking one tile can get expensive when they cost £30 por £40 each ! I like about 400x400 or so or 450x300 for walls. I have had no problem laying this size if the base is done properly. It feels modern without being awkward to lay. Ferdinand

Welcome. I think you need to ask your estate agent Principal. If you are selling soon they will give you an opinion for both options - but you need the staff member with the long trousers. Ask several EAs, then you will need to use your skill and judgement. Ferdinand

I have just drilled 100mm hole for a soil pipe but forgot the socket in the y piece had to go into the wall so had to kango it bigger, shame, it was so neat when I started ?

125mm all the way - it's only going to give you 7mm wriggle room all round which isn't much.