Heard a rumour that the Shell Petrol Station by the Noke roundabout at Chiswell Green is the busiest petrol station in the UK. Anyone have a view on that?

It seems to be consistently one of the cheaper petrol stations in St Albans and near to M25/M1 so wouldn't be surprised...

(Not affiliated to it, but i monitor prices using: http://tinyurl.com/ex9ty as I have a choice of about four places where to buy (Hertford, Dunstable, St Albans etc due to work.)