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The 'London Area ' is the recording area used by the London Natural History Society and is a 20 mile (32.19 km) radius of St Paul's Cathedral, see map below:

LNHS Area map2

To check the exact distance of any site you need to know the six figure grid reference, this can be done online using [1]- (click on the site and get the coordinates from the link at the bottom of the page). Copy the grid ref to [2] using TQ320811 (St Paul's Cathedral) as the other grid ref. This gives you the distance between the two sites in kilometres, multiply by 0.62137 to convert it to miles.