Thank you for the info, it’s much appreciated. One last question - is there any work permit or visa that I may be eligible for that will avoid us having to spend a year apart?
We thought that the OWP was it, but obviously not! I’m now very worried since 12+ is a long time to be away from someone you love! I assume we will not get a refund on fees for the OWP application that is going to be rejected!
If you withdraw the OWP now, you should get the fees refunded. Don't wait for it to be refused. Ask for it to be withdrawn.
You can come to Canada on an eTA as a visitor and then extend your stay from within Canada. This would allow you to stay in Canada while you wait for the sponsorship application to be processed. However you won't be able to work until the OWP is approved which will likely take 6-7 months (this of course assumes you apply inland once you arrive and include a new OWP with the inland application).
Otherwise another option is the Working Holiday Visa program provided you are the right age. The downsides of this program are that it's closed right now due to COVID-19 and my guess is that it won't reopen until sometime next year. Also, there are only a limited number of spots available to those from the UK and always more people entering the pool (it's a random draw) vs. spots available. So almost certainly not a feasible option this year and no guarantee for next year.
Otherwise your other option would be to secure a job offer in Canada and for your employer in Canada to obtain an approved LMIA so that you can apply for a closed work permit. Generally speaking, it's extremely difficult to find employers willing to go through this process.