This isn't my service but I am a bit of an anorak - I like pubs and the London Routemaster bus and this service is local to me in Walsall, West Midlands so I thought I'd post a link to their website

2523 Ltd is named after bus number RML 2523 and offers a service including pub crawls from £15 pp (minimum of 25 people), trips to the races, weddings etc