Sorry about that
XC is cross country.
Epping would be cool on the Lurcher and Langdon Hills would be OK (ish) but if you went to Danbury you might want a less cross country race orientated bike.
Reality is all bikes will work but something like the Lurcher is a fast cross country bike and that's where it will feel most comfortable.
For me it's like this:
1 - Fast Race Cross Country, no jumps or drops =
Lurcher (
http://www.on-one.co.uk/i/q/CBOOPWX9/on-one-parkwood-sram-x9-mountain-bike)
2 - Trail Bike, just about most trail centres/single track/start to get wheels off ground =
Parkwood (
http://www.on-one.co.uk/i/q/CBOOPWX9/on-one-parkwood-sram-x9-mountain-bike)
3 - All Mountain Bike, just about everything except downhill =
45650b (
http://www.on-one.co.uk/i/q/CBOO45650BX9/on-one-45650b-sram-x9-mountain-bike)
I started with a fast cross country bike and to be fair I didn't see what others saw and couldn't understand why they said the riding I was doing would suite a more trail orientated or all mountain bike until I rode one.
I did have a very short travel (90/110mm) 29er. I now have a very aggressive AM (All Mountain Bike) in the form of a custom Bird Zero like this (
http://shop.birdmtb.com/zero/zero-3-439.html) and a long travel full sus bike.
My Bird Zero is awesome over Epping (very fast and capable), I've also smashed it around Danbury, Langdon Hills, Wales and even taken it to Canada. If Bird do Cycle to Work I would strongly recommend the Zero... and what's best if the do then you can go ride one round Swinley as they run demo days.
Here's my Zero;