Yeah, don't I know it. Was down in that London for work 2 weeks ago - purposely got earlier train down so I could spend an hour in the BM, legged it from Euston to my hotel and then back to Russell Sq for 4pm, ran through rooms full of Mummies and cats only to find the feckin' prehistoric Europe section had been closed for 18 months and would re-open the follwing week. Grrrrrrr.
Still, I bought a good book about Curcus monuments