If you are serious about the 24 hour limit, then you need a faster means of getting between the sites. Two smaller petrol-engine MPVs may be a better bet for a bigger group, or even two cars for a smaller group.

Don't laugh. Lack of this will sort you out faster than any injury if you're not prepared for the challenge. Grab a nap when you can...

This/These will take the strain off you ankles/knees when you are tackling some of the more intense terrain that the peaks throw at you.

Tackle the Ben first...it's the highest and the longest. While Snowdon is certainly no pushover, it is an easier prospect at the end of 24 hours...

...also, the 600 mile drive home the following day from the Ben didn't exactly help the recovery rate, given that we were cooped up in the LDV for 8 hours.

...you can never have enough. Having said that, make sure any liquids are evenly distributed as they are bulky in both weight & volume.

Your knee is a complicated joint...be nice to them!

...unless you REALLY need a placebo. Anyone who has ever asked this will know exactly what I mean.

...ready, or be somewhere else when they come asking for volunteers to  'do a walk for charity, nothing strenuous of course...' You have been warned!