This is what I was trying to post a minute ago. It as forced me to do it as a reply to myself. Presently we have a 100 amp supply with conventional modern meter, compliant tails to the consumer unit (tails replaced by DNO I believe in 2018 when new main CU was installed by a third party. Annoyingly there is no master isolator switch. On the other hand there are no seals presently on the main incoming fuse either.
I am considering getting a smart meter to monitor the consumption of different areas of the house and I am wondering if the supplier will combine this with the fitting of an isolator if we request it. Any thoughts on how best to get this done all in one go?