It's going to have to change sometime. As an example, I manage an office and asked the BEIS and my MP when office workers will be allowed to return. Response was that they 'need' to reduce the number of people interacting with each other, and that office workers will be 'encouraged' to work from home for the foreseeable future as they need to keep the R number across society as a whole below 1.
As for guidance in churches - I am involved in one and the guidance makes it unworkable! Basically it's no community singing, no wind instruments "apart from Organs that need to be cleaned", and services to be kept to a minimum! I get that there is some concern other singing, but the rest of the guidance makes opening the place of worship a nightmare!
I agree that the guidance for reopening places of worship is extremely complicated and especially for many churches with small elderly congregations it will be unworkable.
Will all these guidelines for churches regarding social distancing, cleaning and sanitising, not touching anything that anyone else has touched within 72 hours, no singing etc still be in position at Christmas. If so it is going to be a very depressing Christmas in churches with no carol singing, no Midnight Mass and no Christingles and nativity plays. It is recommended that the 2 metre social distancing remains during public worship because people will be near other people for well over the 15 minutes and probably over 30 minutes. Face covering isn't compulsory but is recommended in some circumstances.
The lockdown completely closed all places of worship and certainly in many diocese of the Church of England buildings have not just been closed, but completely shut down with instructions to make safe and turn off all gas, electricity and water. Even the the local vicar has not been allowed to go into the church building to say prayers. Many church goers where quite distressed when they saw more and more shops opening, markets, garden centres, and even football matches and horse racing starting and yet the church doors remained locked until recently even for private prayer. It was often very distressing when even a small group of immediate family only could not even go into the church for a funeral. Many people could have been really helped and their mental health improved if they had been allowed into our churches and cathedrals to say a prayer and light a candle during this very difficult time. Now that churches are permitted to open for private prayer, and from tomorrow for public worship, the guidance that has to be followed is just way beyond what many of the unpaid volunteers who run our churches can manage. I know of many that have not yet opened and have no immediate plans to do so because regulations are so restricting and complex. Also many of our churches, often large ancient buildings, have received very little income during the last 3 months. If social distancing and all these regulations have to stay in place for more than a few months I think there will be many of our ancient parish churches that will find it difficult to function beyond Christmas, especially if they have no money to heat these huge buildings.