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The South Bucks 10k is a new event to raise funds for the Black Park parkrun. It's being run on quiet roads adjacent to Black Park, just north of Slough, with the last 300m actually in the park. The certified course is looking pretty quick - only 1 minor climb just before the 5k point, and several k each lap of gentle downhill.
Entry is restricted to just 300, and costs only £7.50 or £9.50 unaffiliated. For this you'll get a medal, a £5 sweatshop voucher, a bottle of Lucozade Lite, entry to a raffle for various running goodies, and free parking in Black Park (usually £2.50). And of course a race in some lovely countryside.
Black Park is just north of Slough, off the A412 Uxbridge Road. There is a course map here.