For reasons not really understood by me I have been landed with running a school trip to London. They will be visiting the British Library and need somewhere to go reasonably nearby where they can have free time and 'a sense of London'. Covent Garden has been suggested as being a 20 minute walk away, but I can't work out whether it's an easy 20 minutes or endless twists and turns.
If anyone can help I'll be eternally grateful.