Tiling / surfaces

I'm a bit of a novice at tiling, so here goes with a couple of questions :-} (the tiles are large "bumpy" whites, so the first question might be moot anyway, as i'm sure they hide a multitude of sins !)
I've patched up some holes in the walls - the biggest being about 8" diameter from a Ventaxia fan (the walls are plastered, not plasterboard by the way) but they're probably not what you'd class as perfectly flat :-} - I know you can get away with a bit of uneven- ness, but how much is too much ?
Would a splash of PVA over any fresh plaster be good enough to tile onto ?
Since it might be a few months (hopefully worst case scenario) before the bathroom gets replaced, what's the score about tiling onto emulsion (just to brighten it up in the meantime) - ok, or leave as-is (bare plaster) ?
Ta :-}
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Colin Wilson wrote:

Any is too much. Us a long straight bit of wood as a gauge and scrape away at high spots with sandpaper and fill any low ones/

Not even that is needed., Just tile.

Whatever.
Not sure why you are worried about it at all if its due to be ripped to bits.

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Bugger, oh well :-}

OK, wasn't sure, as I was asked in a specialist tile shop while we were looking for some whether it would be on new or old plaster...

Because until such time as it gets done (which may even end up being next year depending on what the as-yet-unknown-quantity of a plumber (friend of a friend) who said it'd be a month before he could even look at it, it's a bit dark and dismal in there :-}
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Had a look at this last night, and mine wasn't actually too bad (2mm at most) - the original wall was done by a plasterer, and it was about 4mm out towards the top of the wall over a 1.5m length
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On 27 Sep,

3mm was what we used to specify. One of our CoW's would insist on going back to bare wall and replastering from scratch if it was out of limits. He rarely had to more than once!
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