My major problem with this movie (Spoiler)

I thought it was a most unlikely scenario, for Mark to throw the phone out of the window, when in fact Mark should have been calling for an ambulance and getting her to hospital in ten minutes. They do have a very excellent ambulance service in the UK, and naturally a responsive National Health Service. BUT no, Darcy would rather have an ageing mother (who needs more care than usual) be carried down the street by him and Jack. In the same time he took to get the Pizza guy involved, he could have gotten an ambulance. Similarly how did he manage to contact the Pizza guy, and Jack without a phone? He was too busy carrying the heavily pregnant Miss Jones down the street. The movie totally lost credibility at this point. Add to this, the plain fact that neither the City of London, or London's Metropolitan Police would have allowed any march/protest which would have blocked access to a hospital or main thoroughfare leading to a hospital.