If you're taking route suggestions, as you come into Chelmsford I would stick to Chignal Road to the lights, do a left then right into Beaches Drive, then onto the mixed use path that goes through the parks. It's all tarmac, and is the route I will be taking heading in. I stick to the road coming out.
EDIT - hopefully that's not what Carlos also suggested ... just realised he mentioned 'park', but in relation to Melbourne, which looks like it is further north.