The contrast between Marrakech and London is huge, of course. Marrakech is challenging and fascinating, but not an easy place to travel. London is a world city, full of anything and everything you want or need, but I don't feel the need to write things up for posterity, because it's all quite well known and I wouldn't be writing up anything new.
So, just a few quick notes. We went to the HMS Belfast our first day in London, which was great though Eric and I got separated (each with one kid) and without working phones, it was hard to find one another again. The next two days, Peter had diarrhea, so badly that I stayed at the hotel with him to get over it, and actually bought diapers when we ran out of clean underwear and the hand washed ones were wet. I wondered where the diarrhea came from? He had diarrhea in Marrakech, but that had been gone for 2 days by the time he got it again. Was it a relapse of the Marrakech diarrhea, brought on by eating too much in London? Or was it a new strain? I was very grateful to be in a nice comfortable hotel room in London (with central heat, carpeted floors, lots of light) instead of being in the place were were at in Marrakech - interesting, unique, but not very comfortable.
We took taxis a few times, but then switched to the subway system, which was fast and convenient (except for the first day we tried it, which was a holiday with restricted schedules). The hands-on section of the science museum was a favorite, especially the dry ice table.