Hi Greggers,
Welcome to the forum
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I'd suggest keeping an eye on the ride calendar in the top right-hand side for rides you'd like to join.
Then in respect to lids (a) somebody will come along and give much better advice than me in a moment and (b) I'd leave the full-face unless you are planning some serious downhill stuff & jumps - and if you are then your bike is probably not best for it
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Just some advice; I don't know the area well but you mention the Hadleigh Downs - if that includes Hadleigh Farm (Olympic MTB Site) then just note the local bike club look down on anybody riding it without permission (and nobody has permission yet...)
Other than that -
Stumpie