Culdrose haven't had a 2nd standby available for months due to crew shortages and we are struggling as well at the moment. However, both 1st standby crews already cover a lot of the Channel (we cover the West of Portland's patch when they are tucked up in bed
)
As far as the MIRG crews go, the only training they do with us is being winched to the ships (ferries usually), I don't know how much specific fire-fighting at sea training they get.