I've stayed at Abbey Wood a few times and being one of only two CC sites inside the M25 it is invaluable. The site itself is very secure and quiet considering its location. We always use the train once on site - the station only being a few minutes walk away - and come 2018 the new cross rail service will get you into central London in 12 minutes! Even now the journey into London isn't a chore and with so much to do you'll need to come back again and again. During my last visit I was working on 12 geology time trails in south east London (each 1-2 miles long). They are designed for non-experts and one of the trails starts from Abbey Wood station, taking you to a site close by where you can find 55 million year old shark's teeth! Find out more here - http://www.audiotrails.co.uk/discovering-sharks-teeth-in-south-east-london/ The wardens on site are very friendly and helpful and if you time your visit right you can be the beneficiary of free sweet chestnuts too!