Thank you all for your support and suggestions. I agree with the point that our children should have other options open for childcare - I remember, although my mum helped me, I always had other friends or 'aunties' and didn't rely solely on mum. However, this situation has been resolved now- I think because my daughter twigged (because she's a personal trainer) when I told her my latest injury is to my sacro iliac joint (very painful), and that means I really can barely walk on my right leg when I first get up. Anyway, she messaged me to say 'perhaps I could get Cassida to have the boys till 10.30 a.m.' Oh dear, why didn't she think of that in the first place, but never mind! My perceptive husband did say 'because you're so energetic, slim, barely have a line on my face and people think you're 20 years younger' (probably thanks to my personal 40-year anti-aging experiment!), maybe my daughter finds it difficult to remember my real age. She does say she always thinks I'm 42 (which is funny, because she's 42 this year!) Still, I mustn't complain. As I said, I've always suffered with back pain and I have no other illnesses or conditions so no meds, so in a way I'm lucky. Perhaps after this episode, any babysitting requests can begin at 10.30! Here's hoping!
To think that London, or anywhere else for that matter, does not belong to any one demographic