Have lifted a carpet and on sweeping up a couple of bits have crumbled and lifted and have left a little crater (about 50p size/slightly bigger).

Before new underlay goes down and carpet anything i can use to fill the gaps?

I have the basics at hand, sand/cement/fibres/few other items that might be able to be used. But don't want to put a whole layer across the floor.

Gripfill, caulk, anything that will be dry before the carpet arrives. 2 part wood filler etc.

Sand and cement will not always bond if it is too thin. Cement on it's own is much better.

Carpet won't be for a while, so have plenty of time. Just wondered what was the best solution?

Rapid setting cement.

I don't have any but don't mind getting a bag, would i do a wet mix and brush it in or a thick one?

wet mix will be fine. it won't be wet for long though lol

Get a small bag of self leveling, dampen the areas then apply.

I bought some quick set cement, mixed it with more water than recommended, then poured it into the holes. I waited for it to stiffen, then used a shoe to smooth it. Totally non kosher, but it worked.

Is self levelling normally this expensive.

http://www.diy.com/diy/jsp/bq/nav.jsp?action=detail&fh_secondid=10487644&fh_location=//catalog01/en_GB/categories%3C%7B9372016%7D/categories%3C%7B9372048%7D/categories%3C%7B9372249%7D/specificationsProductType=floor_levelling&tmcampid=4&tmad=c&ecamp=cse_go&CAWELAID=350176962#BVRRWidgetID

If i went for the quick dry cement, would you think it would be fine to do now, although carpet may not get down for another month or so? Or should i leave it to just before the carpet goes down?

It does and will have light traffic over it until carpet is fitted.

Now will be fine, its not meant to be left as a finished surface though.

So either cover it up, or do it a few days before the carpet goes down.

With carpet you could lay it up to the next day. You only need to leave 1mm per day if you are installing something thats not breathable. E.g. laminate, karndean or ceramics.

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