Will be in London on March 24th and leaving March 30th. I have a Heathrow Express train ticket for London Paddington to Heathrow on March 30th. I will be staying in zones 1 and 2 for sight seeing , eating, theatre etc EXCEPT for 3/4 day going to Windsor Castle and another 3/4 day going to Hampton.
Which is the best option- oyster payg or oyster payg and 7 day travel card zones 1 and 2?
And can I buy oyster payg at the self service machine at Heathrow Terminal 5?