We have just spent Christmas at this site.  It's a site so very close to facilities and yet it was teeming with wildlife.  A five minute walk to the station and armed with an Oyster card it's easy to get into the centre of London.  Trains run very frequently.  The bus stop is just around the corner if that mode of transport suits you better.  There are numerous walks available. The Green Chain walks link the green areas around London and again a five minute walk gets you into these waymarked walks.  Easy to cycle down to the Thames Path and then on into London centre.  Lovely clean and spacious showers and toilets.  All in all a great site, well worth visiting and even though it's in the LEZ it's worth checking online if you are exempt.