wrote:

I was told them painting on them directly would give me an slight
uneven texture on the painted walls (even with 2 x undercoats) and

It depends on how well the new plaster was blended into the old - it
*is* very hard to get an absolutely invisible join when replastering
only part of a wall. The colour of the plaster won't matter as long as
your pait is covering completely, but you may see the join between old
and new. Easy way to find outis to paint a bit and see.

lining the walls first would be the way to go. Id this right? Is there
any other way? Would applying 2 undercoast not suffice? Seems lining
the walls with paper first seems a lot of hassle!

If you are not happy with the painted finish, then you have two choices
really. Lining paper, or reskimming the whole wall. The latter sounds
quite drastic, but you may be able to make other worhtwhile changes at
the time. For example if the outside walls are solid and not well
insualated you could line them with celotex or similar insulation board,
and then dryline with plaster board inside of that. Nett result, much
better insulation, and nice smooth walls into the bargain.

--
Cheers,

John.

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