The best way I have found to enjoy UK Festivals in recent years has been as part of the Workers Beer Company. Charities and Trade Unions that support WBC are asked to provide volunteers to work the bar at various festivals around the UK. You donate your time for free and WBC pays your wages to the charity that you are volunteering for. In return, you get a separate camping area, vouchers for two meals a day (in your camping area) and vouchers for two drinks once you have finished your shift. A win-win situation if you ask me!
You don't get to see every band that plays, but the banter behind the bar is always good fun and you get to see more bands than you would working in your local. See if a charity you support is part of WBC and get invovled!
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