As someone who has been a tourist in London multiple times, I've never done anything other than catch public transport in and out. Be it Heathrow or the other airports, they're all very accessible by public transport. More so than a lot of other international airports (for example Melbourne Tullamarine)
If you fly in internationally the Heathrow Express also quickly deposits you at St Pancras. Unfortunately, despite the speed, it's not worth the additional cost in my opinion.
If you fly in internationally the Heathrow Express also quickly deposits you at St Pancras. Unfortunately, despite the speed, it's not worth the additional cost in my opinion.