I think threads like this are very harmful. Obesity and inactivity are taking years off peoples lives. And if the US is a guide, this will get much worse in the near future. It's an epidemic.
Get the kids away from the playstation; unstrap and unpeel them from the back seats of the car and get them on a bike. And sure, get the grannies to get their old bone shakers from the shed and wobble to the shops in some fashion.
Turn SE23 into the cycling oxford of London, with bikes chained 5 deep at the station, schools and the shops! Once there is enough demand, the council will be forced to properly and safely accommodate casual cyclists, by creating wider mixed use pavements, or dedicated unbroken cycle lanes.
Ultimately motorists will lose space, will be forced to slow down and possibly drive more safely and considerately, so no wonder they rather cyclists were just banned! This is not going to be easy, for sure.