That sounds like a programming limitation that should be amended then, rather than requiring the re-issue of a new number just because somebody can’t be arsed to write the code to allow it to be changed.
The NHS systems are so antiquated at this point. They really need a complete re-write to be fit for purpose.
In the morning, butter. As much butter as possible. If I’m in the mood for a snack in the evening then toast them first, some ketchup, cheese, few mixed herbs and in the microwave til the cheese melts. Crumpet pizza ftw