They don't have any left-luggage lockers in the London terminals of the sort they have in other countries, allegedly because of the possibility of someone depositing a suitcase with a bomb in ot.

Instead they have Left Luggage offices, with a charge of £5 for every item. Why that is supposed to be in any way safer than coin-in-the-slot lockers is something I haven't been able to work out. They don't have any security procedures or anything like that, it's just done the same way it's been done since Victorian Days. There've been various detective stories over the years involving bodies being deposited in trunks. Maybe the £5 charge is supposed to stop that kind of thing happening...

The British Library sounds a great idea.