Tell them to do one, the carport wouldn't come under building regs and the "conservatory wouldn't provided it is under 30sqm and retains the external door to the house and doesn't include gas, electrics or water and as fmt said there is a limitation of 12 months from completion for enforcement of building regs. There is nothing to indemnify against.
There's some sense in this. When I've been pushed for stupid nonsensical items before I've always pushed it back. Within the last 4 years I've sold 4 identical house from a small development of 4 and each person dealing with the conveyancing has come up with their own separate and independent stupid questions. Now if they all came up with the same then fair enough but one asked for the original planning permission, one was concerned about a covenant on the deeds from 100 years ago, another asked so many questions I told the purchaser to either get a new solicitor otherwise I'm not selling the house to them. They did in the end.
Drives me mental anything to do with bloody solicitors.
I have more story's come to think of it but I'm getting annoyed just thinking about them!