Following the spoof email for a Bin Laden-free see-through rucksack, Assist Safety Project are selling a range of clear vinyl bags and cases designed to assure your fellow commuter that you’re not carrying a little something extra with your cheese salad sarnies.

For would-be bag snatchers they add the convenience of knowing who’s worth robbing and who isn’t…

Actually, these are a little more practical than the posters now being displayed by London Transport whose attention it is to make travellers feel safer. The posters inform us that there are more police on the underground, random checks and police dogs.

This is all very nice but I suspect none of these things will prevent a concerted effort to detonate more bombs on the Tube if somebody out there has the desire to do such a thing.