So you don't actually need a visa.
No, but I do need an extension, actually I think we could be married before the processing of the extension application starts (during implied status) in fact it's very likely we would be married before a decision had be made by CIC. Processing at the moment looks like 79 days
There had been posts similar to yours that were actually able to gain entry into Canada without problems or at worse were given Visitor Records. I don't think the IOs at a POE would deny you being together with your new wife. You can bring copies of the receipt you had paid for your PR apps to show good faith.
As I currently have a visitor record, maybe the IO'S view would be I have been in Canada too much already.
I have visited a Canada lot, but I have never overstayed, so I guess that helps.
And having enough ties with the UK (your job and family, though your new wife would be your family).
Clearly at the time I return, I will be married and want to be with my wife (who can support me until I have a work permit and a job).
And it is true that we would be returning to the to UK celebrate our wedding, but wouldn't my visit be seen as a husband wanting to stay in Canada?
Something that IO's are not likely to allow.
Just answer their (officers') questions truthfully.
I always do, but that doesn't make it any less stressful
