Fischer Fischer SX Nylon Plugs 4.5-6 x 40mm Pieces
The best for heavy fixing
Not cheap, but worth it. Used to fix the wall brackets for several very heavy radiators - combined with 6x50mm coach screws (25506) they gave a very solid hold in plastered brick walls. 8mm drill hole.
30 Sep 2014
Don't by cheap wall fixings it's worth paying extra for these plugs
5 Sep 2014
Best Rawl Plugs
I've been using these for over ten years and will not use anything else for fixing into blockwork.
Drill an 8mm hole and use a 4mm or 5mm screw for a very strong fixing.
For plasterboard I can recommend Fischer HDF plugs (also stocked by Screwfix).
15 Dec 2013
I use nothing else
Strong, reliable, removable (if you find the drilled hole not deep enough). Quality product.
25 Oct 2013