Um, if looks like if you mention a certain company your post gets held under review?

not big or clever

Actually correctly installed yellow plugs will hold up human weight simply because of the shear strength of the screw, the point is that many homes have bricks made of Lancashire cheese and the holes are typically drilled with a blunt twiglet.
Secondly, hand a millennial a red rawlplug and he'll drill 1 one inch hole into plaster and never hit a brick.

Always go overkill on fixings. I once merely touched a shelf that was held up with red rawlplugs, if fell to the floor and broke a number of expensive glasses. Clearly the owner was expecting a Forth Bridge structure, merely because it was attached to her wall and up till then had never fallen off.
That was £100 in breakages simply because some muppet thought that a red rawlplug was good enough.

Why specify 10-15mm longer screws without considering what you are fixing?

Yes the lip is weakest point, the point was that plaster is even weaker and you do need to actually be able to see the plug in order to get your screw in the centre.

A screw is typically 3p, a rawlplug 1p, what's the point in carrying a bagful of red and yellow ones when the occasions that you will need to fix a 100g door bell to the wall are few and far between?
And what's the point in risking a failure when you can happily use the biggest screw that your mounting point can take, all for 4p.

M7 drill, brown rawlplugs and 4mm/5mm screws in a few different lengths - that's 95% of most jobs sorted.

Good price for Rawl but I got these and they do a great job.

http://www.screwfix.com/p/easyfix-wall-plug-selection-pack-mixed-3-6mm-600-pcs/18139

got these from screwfix ages ago, or something in near identical packaging and they are great. Anytime I buy a new item that comes with rawl plugs, I instantly swap them over for these.

Nonsense, correctly installed red raw plugs are strong enough to hold up human weight.
What you need though is to make sure the correct size drill bit is used and that the correct good quality screws are also used.
btw) The screws used should be roughly 10-15mm longer than the raw plugs used, the raw plug should be pushed back into the hole drilled before screwing in. The lip of the drilled hole in the masonry wall is it's weakest point and susceptible to blow out hence the need for longer screws and deeper drilled holes!

In 35 years I've never used those small rawlplugs for anything?

If you need to fix 'something' to masonry, then generally you need something bigger than a 2mm screw to do it with.

50 brown 7mm Plasplugs for £1.29 from Screwfix,
frankly if you use anything cheaper or smaller then you are just making trouble for yourself.

tip:
rawlplugs are designed to hold a screw into a brick - so after you've drilled a hole through the plaster, tap the plug down level with the brick, don't leave it sitting on the surface of the plaster, it's not going to do any good there.

I use these. They're perfectly good plugs for basic home DIY stuff.

sorry no picture on B&M website.[img][/img]