In reply to hokkyokusei: I also did Bradford this morning, though stopped due to gut issues. I normally run Roundhay Park, though have also done Leeds Hyde Park, Pontefract, Worcester, Leamington Spa, Pennington Flash and should be doing a special New Year one at Huddersfield tomorrow.
I really like them and run them most Saturdays if I've nothing else on. I've a pb from last summer of 20.13 from Worcester, though have a habit of getting out of race mode with them and volunteering instead - I should race them hard more often as they're really good speed work, especially Roundhay which is basically a set of longish hill reps.