the can looks spot on! i live in norfolk which is a bit of trek but i'm sure i'll be out that way at some point so i might take you up on that.
i know where you're coming from about keeping low rpm in villages etc but they can hear you at least a mile before they see you (before i see them more importantly), its pretty flat/quiet out here in the sticks! so im hoping to keep it legal-ish at least until my gasto points are removed next year
thanks for the offer!