I applied for a new job around a month ago and have just been told I've been successful, but it doesn't start for another six weeks. I only have to give one weeks notice according to my contract but I'd like to be as helpful as possible and give a longer notice period as there has been staff shortages recently and other managerial changes, which involve myself. The problem is I'm concerned that by giving a longer notice period than needed they could ask me to leave after one week, as this is all that's in my contract. Could they do this? Are they allowed by UK law? Obviously due to staff shortages I think it would be unlikely they'd do this, but I can't afford to be out of work for over a month and they could be petty about the issue. I'm not leaving for a competing company and I've made them aware that my career goals lie elsewhere.
Any help would be great!

