DT - I'd say it's borderline. You'll be at your most tired and I think it could reduce the effectiveness of the taper. All depends on how well you recover really. May be do it at MP with the last 3 at HMP?? Or just find a 10k and blast that all out with no worries
HR, Joolska etc - all my dealings with UKA have been a pain in the arse over the last couple of years. They wouldn't let me join Winchester as they said I was still affliated with another club (I'm not) but they wouldn't tell me which one!! In the end my club had to register me with a full stop at the end of my first name!!