@Lemons1571 there is a lot of ‘guidance’, and then there was also new legislation (published Friday afternoon) that came into force last Saturday that is a bit clearer in terms of what you could get fined for.
Police cannot enforce the guidelines so anyone can come and go in and out of the lockdown area if they want to. The guidance suggests you should only do this however for ‘essential’ reasons e.g. work, caring for vulnerable person etc. There was some police presence on a few roads last weekend stopping random cars and asking people why they were travelling, but like I say they can only advise. There’s 1000’s of staff coming into the area to the hospitals every day for example. Impossible to police properly.
The enforceable issue comes with staying overnight away from your primary residence. This is not allowed (unless you have a support bubble as a single adult household). There’s also legislation around non essential businesses too and being able to shut down or fine if they stay open.
Lots of people I know had booked a holiday for next week. It’s Leicester’s traditional holiday week, as schools break up here this Friday. Most holiday companies have been cancelling/rearranging anyone due to come with a lockdown postcode, but guessing there’ll still be a lot risking it. Don’t think refunds or change of dates are guaranteed.
I would say very few people really understand exactly what you can and can’t do legally. It’s not been communicated well at all.