Stripey, I think that scenario the more likely leaning towards at present rather than one which is not leaving. It fits with what the EU might be prepared to offer.
I don't agree with abolishing the HoL. I think it needs reform, but not abolition. The Upper Chamber is a check and balance to the lower Chamber. Having two elected chambers doesn't necessarily serve the country well. It is what the US has and it causes problems.
I confess, I am coming around to the idea of PR begrudgingly. This is something I've always been opposed to previously.
Surfer, DH has said we won't leave since 24th June. He's a remainer. I'm suspect his reasons for believing we won't leave are probably different to your DH's. DH doesn't think a lot of the government and thinks the public will be the ones to do it eventually rather than a 'stitch up from the elite'. Part of me wishes that I shared this view.