Heritage Open Day: Happy Harold the 1928 classic trolleybus will be out and about on the 2 Saturdays running around some of the sites that are taking part in the Heritage Days Happy Harold is a vintage vehicle and believed to be the only operational Trolleybus running in the UK and Europe today. He first came into service on 1st April 1928 and was based at the Silverhill Depot. He is currently looked after and run by a small team of volounteers.