hi, max,

I don't blame you for being confused.

I lived and worked in london for 15 years and i can't make head or take of it.

personally, I'd go to Paris!

regards, ann

Thanks everyone now totally confused.
From all posts I gather that the best way to travel is in the format of some pass.
Lets put it this way , I would like a ticket from Heathrow upon arrival 1st April and then be able to travel for 3 days above and below Ground
So is it a 3 travelpass that allow me to get 2 4 1 v Oyster Card.
Thanks

Just buy a 3-day, 6-zone off-peak Travelcard and everything will be covered. It's not an Oyster card, but that doesn't matter very much in your situation.

The London Pass is rarely cost-effective. If you use the twofers, it almost certainly wouldn't be.

Opinion on the ho/ho bus is divided. I think using your Travelcard on public buses is a better deal, using these two maps:

http://www.tfl.gov.uk/tfl/pdfdocs/cen_bus.pdf
http://www.tfl.gov.uk/buses/pdfdocs/centlond.pdf