hi, just wanting advice and tips really, I am going to london tomorrow with my mum ds1 (aged 4) and ds2 (10 weeks) getting the train down and we are going to history museum, science museum, hyde park and ds1 wants to go to hamleys, just wonderng whats the best way of getting from one place to another with a pram?? i was going to take sling but ds2 is a big baby and i struggle with sling a bit tbh, if i have to collapse the pram it will be difficult to carry as its a bugaboo and is in 2 parts, am i going to be best getting black cabs for ease?? any advice appreciated