Glad mum and babies are doing well.
I don't know about the rescue situation in Dagenham - I grew up there. In fact my mum rescued a dog that's owner was going to have PTS for being pregnant. This happened literally days before we moved to Dagenham from East Ham. My mum had no choice but to advertise the pups as FTGH as there were no other options then (this was early 70s)
I'm sure I remember seeing a reference to a woman in Chadwell Heath that does rescue - not sure where I saw it though. I will have a look.
Edit - The only one I can see around Dagenham is Mandy's Moggies on Catchat. You probably already know about them.
MANDY'S MOGGIES CAT RESCUE
Based in Dagenham, Essex
Specializing in handrearing orphaned kittens, rescuing and rehoming adult cats and kittens, also trapping and neutering feral cats. Rescuing and rehoming for many years, Mandy's Moggies always has a selection of super adult cats and often kittens, in need of loving homes. If you can give either a kitten or cat a home for life, please contact as below.
Fosterers and Fundraisers needed: Please call if you could help by fostering a cat or cats between homes, or if you could help with vital fundraising.
Tel: 0208 517 4938 or 07905 313982