Ooooh, SteadyCJ, so tomorrow you get the cast off??!!!
Fantastic. Swim? Why not? 
I'm on the M25 too, but J25 so exactly the other side of London to you.
Did my first brick session today. 5 miles hilly cycle immediately followed by 5k run (one little hill). It felt awful. Legs like sausages and was convinced I was going so slowly. But the 5k only took just over 31mins so pretty pleased with that. I haven't been cycling long enough yet to know if my time is okay. But I got up to 25mph coming downhill today and got scared! I know, I'm a bit of a wuss, but I don't like going that fast.
Hope my legs have recovered by the morning cos I'm supposed to be taking my big girl to parkrun.
(Made chocolate chip cookies with my Smidge this morning)