Does anyone have any suggestions either by bus or train to get to Milton Keynes.
Trains run several times each hour on all lines, so no worries about waiting.
Beware weekend travel as tracks are sometimes closed for maintenance and repair work.
Full schedules and fares
Trains from Chislehurst continue 2 stops beyond London Bridge to the terminus at Charing Cross. The Underground (= Tube = Metro = Subway) runs direct from Charing Cross to Euston too. Besides, if you have luggage and would rather take a taxi between the two National Rail stations, it's a bit shorter and cheaper from Charing Cross (£13 as opposed to £15.50 according to the fare calculator webpage I use, but that can vary with traffic and time of day).
If you don't have any heavy bags, here is another option, which avoids the tube.
Train to London Bridge. At London Bridge wait on the same platform for the Bedford train, and take this to St Pancras. From St Pancras it is a short walk (less than ten minutes) to Euston for the Milton Keynes train.
If travelling at weekend, check for engineering disruptions.
You can buy a through ticket from Chislehurst to MK (25.90). But if you are travelling off peak, you can travel for less by buying separate tickets from Chislehurt to London (£5.30) then London to MK (£13), even allowing that you need to add a tube fare or bus fare between the stations. (That sounds daft - but these anomolies do sometimes crop up with the ticket pricing structures).Edited: 04 May 2012, 18:54
I want to thank everyone who took time out to respond to my question, I appreciate your responses.