Sorry I'm a bit late to this one, a fascinating thread!
Ken Kitson & Louis Emerick tried to get a spin off off the ground in 2014, Roy Clarke was onboard with the writing from what I can remember and Alan Bell was keen. This could've been a back door way of getting many of the LOTSW characters back. No TV companies were interested so they were trying to fund a few episodes via Crowdfunding, but sadly they didn't get anywhere near the £20,000 I think they needed.
I pledged a donation as I thought this would be more fresh than resurrecting LOTSW, but sadly it wasn't to be...