The WCBS is a rewarding and not-too-time-consuming survey, which helps to monitor the status of the UK's butterflies across the wider countryside. Participants are allotted a 1-km square and a fixed route to walk; the minimum level of survey required is two visits during July and August, but you have the option to make one or two additional visits during May, June, July or August. The visits must be at least 10 days apart.

You can find more details about the WCBS scheme here.

The following squares are available
SU8026	Hill Brow, Milland			SU9521	Tillington, Petworth
TQ1025	Billingshurst			TQ1127	Nr Barns Green
TQ1130	Slinfold			TQ1234	Rowhook
TQ1435	Winterfold, Horsham			TQ1932	Roffey
TQ3030	Balcombe			TQ3229	Ardingly Reservoir
TQ4700	Bishopstone			TQ5825	Mayfield
SU8801	near Runcton			TQ6313	near Herstmonceux
SU7707	Westbourne

Click the grid reference to show on the map.