Just in case anyone needs to fill up today, I can confirm that as of 8:30 this morning, Wheddon Cross had "plenty" (their words) of fuel, although they were very busy yesterday and will be today.
I am told that Wheddon Cross is out of Diesel (monday 27th)
North Molton Garage (JJ Garages) are also currently supplying £25 worth of fuel, as I experienced today, Monday 27th.
Thanks Steve. That's really helpful information.