Tiling on bathroom walls

I have three questions please about tiling in bathrooms.
1) I have a bathroom with half-height wooden paneling. It is made o quite thin tongue and groove wood. It is impractical to remove th paneling as this would mean moving and re-fixing the WC, basin, an bath.
Would it be wise to tile over this paneling please?
The alternative would be to tile only above the paneling and give th paneling a coat of gloss paint.
2) Tanking in bathroom - should I insist on it?
I've had a quote for installing a shower and adding to the existin bathroom tiles so that the tiles go all the way up to the ceilin (different house to my other question).
I've read something on the internet that says tanking should be done This seems simple as it is apparantly just painting the plaster surfac of the wall with a waterproof coating.
The quote does not mention anything about tanking. Should I insist o it?
The house is about twenty years old. Currently only the lower part o the wall around the bath is tiled, with plaster above.
I wonder what the chances are of the builders using waterproo 'plaster' around the bath? Would UK building regs of the time hav required it, do they now?
Is there any clear or nice-looking tanking coating that I could pain over the plaster without needing to tile it?
3) Change in spec for quote - much change in price?
Recently I asked three different bathroom installers to provide a quot for installing a shower over a bath and adding to the existin half-height tiling so that tiles will now go up to the ceiling.
Only one of them actually provided a quote, but that quote seem reasonable. I have already bought the tiles myself.
Perhaps I should instist upon tanking being done also - which I believ is merely painting the plaster with a waterproof coating before th tiles are put on.
In order to try to disguise the join between the old and new tiles I've just bought some mosiac tiles. I would like a border of a singl line of mosiac tiles (about 2.5cm square each, currently stuck to plastic mesh) to go around between the old and new tiles. The tota length of this border would be about four metres.
Does anyone know by how these two changes in spec would change th price please?
Thanks very much for all helpful replies to the above three topics
-- fred2
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fred2 wrote:

That's really not such a big deal... it's what you should do IMHO. If the house is only 20 years old you as you say it's not as if you are going to have lots of tricky old fittings to contend with.

Probably not - depends how rigid it is. If there's any 'give' your tiles will pop off. If it's really firm you'd probably be OK.

I think that would look incredibly odd...

No - I think you'd get some quizzical looks from the plasterer. Unless this is in a subterranean room you don't need anything like that; just tile on to ordinary skimmed plaster walls.

No chance at all! Certainly isn't a building regs requirement.
David
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fred2 wrote:

If it's in any way bendy, no.
And it shouldn't be that much work to remove and reinstate the sanitaryware.

I doubt it; I don't think any plaster is really "waterproof"

Pass, but have you costed how much it would be to rip off all the tiles and redo in matching? Ha'porth of tar etc.
Owain
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