I don't believe any extension to the restrictions for Leicester has een announced yet, although seems likely. The food production factories are already closed, with all staff tested (that's how they know the apparent extent of the workplace outbreak), with staff isolating, in line with the guidelines.
I'm following this carefully, as I live in the county, although about 15 miles from the city, but I do have a clinic appointment at one of the main city hospitals in about 3 weeks, so I'll be keeping y eyes peeled.