Watford

At the bottom of the local market, unleaded starts around 143p per litre right now. A few outlying forecourts price well above the typical local level, so the average is a better guide here than the extremes.

The supermarket sites, including Asda and Costco, tend to set the floor for prices here. 4 of the 30 local forecourts are supermarket-run, and the rest split between branded and independent operators.

Costco around Hartspring Lane has been setting the cheapest unleaded price locally of late. Several of the busier sites sit along St Albans Road and Allum Lane, so you can check them against each other without leaving your usual route.

On average, unleaded here runs a little under the wider East of England figure. For diesel, expect an average of roughly 165p per litre locally.

Everything within about 8 km of the centre is included, so edge-of-town and retail park sites appear alongside the central forecourts. Prices in Watford can move mid-week as well as at weekends, so the ordering above is worth a glance even if you always use the same forecourt.

Use the live table for the exact prices at each site, or set an alert if you would rather be told when your usual stations drop.