Darren Briggs was queueing to pay at his local Shell garage in Pembrokeshire when his blood began to boil. An irate holidaymaker was accusing the retailer of ripping him off on the price of petrol, which was apparently 15p cheaper at a Tesco near home in Birmingham.
Briggs, who owns the petrol station operator Ascona, couldn’t help but step in. “I explained to him that there are varying time lags on the pricing of fuel depending on…