For anyone wanting to get married in the UK, you might want to look into Gibraltar.
My partner and I got married in Gibraltar at the end of April. He's a UK citizen, I'm Canadian. I was in the UK on a visitor visa when we got married.
Gibraltar is like the Vegas of the UK

The only requirements:
- book ahead of time (online or by phone)
- to book you need to provide copies of passports & birth certificates (and divorce certificate if applicable)
- arrive in Gibraltar at least one day before the wedding to fill out paperwork at the registry office (took all of 15 minutes)
- show proof that you've spent at least 1 night in Gibraltar
- get married!!!
It was super simple

After the wedding we spent a week honeymooning in Spain and I flew back to Canada to apply for my spouse visa (still waiting).
We've been together since 2015, but wanted to avoid the fiancee visa. Gibraltar was perfect!