Managed to make the booking by telephone today direct with the racecourse 01926 405 560. Although very helpful, the young lady taking the booking was tempted to charge me for two days entry into the event, both Friday and Saturday. Having checked up she confirmed that it was only necessary to purchase entry tickets for the main Saturday event. So the final cost was £28.00. Two nights camping @ £10.00 per night plus two entry tickets @ £4.00 each. Paying by credit card there was no extra charge.
Tickets have arrived by email complete with barcode to be scanned on arrival.
Impressed by the organisation of The Spa Strummers. Well done.