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Sam-
A course in the Lakes, L2524.
I followed the advice from on here to do it despite having a friend's wedding yesterday.
It was a fast course but with a big lump in it you had to go over twice. Nasty headwind on the way out but the way back was really nice, I could possibly have done a PB given my time on the course - but as soon as I realised I'd gone the wrong way, having already had a slow outward leg, I sat up. I sped up when I reached the course again, but ended up with 46km in 1:12.
tbc
Pro tip: if you want to do a PB in a 25, don't take a 6km detour and sit up once you realise you went the wrong way.