Marcus, thank you. (I've only just seen your reply.)
My thought was to - would you believe it - cycle from Taunton rail station to wherever I'm staying near-ish the route. Really really appreciate the offer of a lift though, subject, of course, to timings. (My preference, if I can make it happen, is to arrive 2 days before the event.)
As for the helmet question - there may have been a slight misunderstanding due to my asking "are helmets required?", rather than (as I meant) "are helmets compulsory?" I wasn't thinking of chip-mounting issues when I asked. Frankly, I was braced for a "our insurers require it - no helmet, no ride" response. As it is - I note your "helmets recommended" policy and the logistical problems with how/where to mount the timing chip - fair enough. I haven't tried it yet but I'd have thought it should be possible to affix the chip to any flat smooth surface in the right location to be caught by the reader, for example, to a badge pinned to a cap/buff/headband. Of course, the size of the badge might be relevant - any guidance on that? Do you think this would work?
I'll let you/Emma know by e-mail if I decide to take you up on the lift offer.
Thanks again.