On Fri, 25 Nov 2016 16:22:01 +0000, Andrew wrote:

Wickes fine surface filler can be applied like normal gypsum
plaster, but unlike gypsum plaster you can scrape (*) and sand
it to get a flat finish.

(*) When set but, before dry use the long edge of a steel ruler
at about 30 degrees to remove excess, then when dry
use a sanding block.

The "polyfilla" type products can also be polished just like plaster.
Saves any messy sanding down.

--
Cheers
Dave.