london has a wide and excellent bus service which has been continually improved and combined with the oyster card are now fast and frequent.
your travelcard allows bus travel everywhere.
something to remember is to always have your oyster read by one of the readers. it soon becomes second nature.
how to use the barriers at stations - simple you'd think but stand watching the numpties and you'll realise that people have terrible trouble with them.
as you enter the barrier towards the gates you have your oyster card read on the yellow pad. just before the gates at about thigh level you will see two smallish squares. these are the gate sensors. if you stand in front of or obstruct them the gates will not work no matter how much you wave your oystercard about. on the other side after the gates are open are the same sensors which monitor the exit from the gates. if you are carrying a bag ensure it is carried right next to you with no gap between you and the bag or the sensor will think someone else is trying to sneak through and close trapping your bag.
always wait for the barrier light to say ENTER before proceeding through - the reason is too long for this time of night but please do it.
full info and maps can be found on the rather enigmatically named www.tfl.gov.uk site. however, if there are travel problems i've also found that, bizarrely, the bbc london website travel section is often rather better informed.
if you wish to travel to the south downs area - southampton to ashford only on southern railways you can buy a downlander all network self printed ticket for £12.50 which weekdays restricts travel to after 10 am but covers the whole network and buses about the brighton, eastbourne and lewes areas. available only online and two days notice is required. search google with "southern downlander" as you'll never find it on the southern railways web site.
hope this has been useful for you paddy. dinner now calls....(aka the Angel)