Thanks both David and Brian.
After looking on that site, I fuelled up before and after this weekend's RIBing at Lymington Yacht Haven as their petrol price on the site was the best in the Solent. In fact, it gets better...if you buy over 100 litres by switch, cheque or cash (NOT Visa) then the price fell to 81p per litre.
Almost petrol station prices.