Which filler?

No need to skim if you're prepared to put in a bit of effort.

Sand down the area to make sure it's flat (don't worry if there are depressions). Then fill with Tetrion (I find Polyfilla crap because it sets like concrete, while Tetrion sands down very nicely). Then sand it. Keep doing this repeatedly. Don't be tempted to fill too large an area. Build it up in layers if necessary.

When you think it's perfect, paint the wall white and it will show up a lot of blemishes. So carry on with more filling and sanding.

It does take a while but you can get a perfect finish if you are prepared to put the work in. I even do this on newly plastered walls as I find they aren't perfect anyway.
 
get a bag of easy fill it will do the whole room and it will work out much cheaper than buying boxes of filler.most builders merchants or decorating centers will have it.a good tool to pick up is a caulker not the tube filler but a tool that lookes like a rectangular piece of grey plastic with a wooden handle along the back.this is great for skiming large areas.does the same job as a trowel really but easyer to use if your not used to a trowel.you will also need some 120 grit fine sand paper as this will rub down the easy fill dead smooth without the scratches you will get using anything coarser.it might be an idea to give the walls a coat of oil based primer to give yourself the best base to start your filling and decorating.ps the caulker should not cost more than a fiver.i hope this helps.
 
Scrape off the lose bits, sand it all down, roll it out once so you can see where needs filling better and it will help the filler to stick, then as stukacat said use easy fill (made by gyproc) when the filler is dry rub it down and paint again.
 
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