ok thanks for the advice, so either bonding plaster or lightweight
ready made filler..

i have learned that for internal wall repairs use plaster and for
concrete floors use sand/cement mix and aggregate as well if its a
deep hole.

can you buy the sand/cement/plaster from standard diy shops? they
seem to stock ready made stuff more than the basics.

also may i ask this product i linked to
http://www.polycell.co.uk/products/p...polyfilla.html
i already used some of that inside but now realise its meant for
outside repairs (thats how little i know) will it be ok internally?

thanks everyone