In reply to frecro: I have a marmot dryclime which is a similar idea to the VR smock, and I anticipate wearing this with a helly most of the time.
A Regatta X-ert or something served me alright in Scotland for a week last month, however I think it's probably a bit big if it's going to be in my rucksack for most of the time.
Thanks for the offer, however I have tried one on before, and even a large is big around the chest.