I'd heard that about British 10K, but couldn't speak from experience - what was it like COugie for you? I'm assuming here that you ran it, forgive me if I'm wrong.
ALthough the weather was absolutely dismal last year for 10 000, I thought for an inaugral event the organisation was smooth, and I personally was impressed by the support of the water station people, marshalls and Londoners that came out to suppor this one - they were relentlessly cheerful and supportive, it (for me) made the event quite thrilling.
Good luck with choices.
If you wanted an additional July 10K - www.greatrun.org they have the Great Capital Run on 26th July. Large crowds, chip-timed, and the last 2 years it was in Hyde Park (though I note it is TBC on the www site so far). Race entry not open yet, but I'd thoroughly recommend this one too, it's fast, well marshalled/organised, large event, nice T shirt and medal, and a lovely atmosphere.