They are good fun Jon, give it a go. You only need to be able to ride a bike to have a go, email Jon and he'll add you to his startsheet, tell him you're a novice to help him cede the rider order. They are a good "how fast can I go" test. I won't be racing the first one, but will be there to push you off, or something similar. They are very laid back events as they are for club members only.
The codes like G10/42 refer to the course and date back to a time when any form of racing was illegal. They used codes so the police wouldn't know where the TT was going to be and nick all the cyclists
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The course we use (G10/42) is up and down the A24. You start in [url=http://streetmap.co.uk/newmap.srf?x=516500&y=146500&z=3&sv=516500,146500&st=4&ar=N&mapp=newmap.srf&searchp=newsearch.srf&ax=516803&ay=147205]Spook Hill[/url] in North Holmwood, then join the A road, straight over the 1st RAB (2nd exit), then around the 2nd (half way point). Then just straight back over the 1st RAB and you finish just short of the 2nd RAB, there'll be a checkered flag so you'll know where.