At the moment in tier 4 you’re not allowed to get married unless in exceptional circumstances. To legally get married you need only to have 2 witnesses and a registrar and this is easy to achieve with masks and social distancing so this should be allowed for couples to be able to begin their lives.
You may be interested in these active petitions
I don’t think it is fair that couples who just want to get married should have to keep putting this on hold when you only need to have two witnesses and a registrar to legally get married in the UK. This is easily achievable with social distancing and masks so I don’t think it is necessary to put a ban on all wedding ceremonies when this wouldn’t constitute a gathering.