I wouldn't look after my GC while their parents worked. I would babysit so they could go out and visit, but no, I've done my time (nearly, 18 year old still at home) and so now I'm just about finding my feet for my own life.
I also had a new baby sister when I was 15 years old, so I looked after her until I married, then had my own daughter two years later and the grump nearly ten years after her so in total I've been childminding now for over 35 years and I'm cooked.
Grandmama123 Please think about yourself a bit more, you've worked hard at getting yourself back out there and making new friends, doing some excercise and starting to lead your own life. You deserve to have some time off now for good behaviour in bringing up your own children. Visit sure, babysit but please think twice before giving yourself another committment you neither want nor feel you could manage. More things will open up for you other than this walking if you continue to make friends and to be tied down again to childcare would make it harder for you to now do as you please. Badly planned if she has to do a full 12 months nursing before being able to go part time and have a little one to find care for. She should have either done the training first or put it off until baby was old enough for day care. It is not your responsibility. 
“We start school too early in the UK!”
A different hot weather question.
the walking has really lifted my spirits in a a lot of ways, I feel stronger, more connected to my community, whole in areas where being involved is necessary.... Little baby girl will need a full time babysitter come January as my daughter heads back to work. I knew the possibility of my looking after baby girl full time, 6:30am to 4:30 pm daily would arise, along with my soon to be 7yr. old twin g sons. Now that I am walking, feeling healthier, enjoying my peers :-), I feel conflicted about losing what I now have to sit in a house in the cold north for 10 hours a day with my adorable g daughter, I don't watch TV.... My daughter posed the big Q, and I told her I'm not sure yet.....
is this happening on other threads?
so I caved in. It was a hard long day (I was 68 then) but the relationship I have with that DGS is wonderful and I was bereft when he started school. I couldn't do the same for no.2 GS because I broke my leg just as DIL was due to go back to work but am now part time looking after no.3 who actually lives in my house with his mum and again it is an amazing and joyful thing to do. 