Hmm ...could depend on a number of factors, Steve - the MAIN two being:-
Firstly, I believe - from what you've said in the past - you're [either] the Deputy or Assistant Warehouse Manager ... responsible for a workforce of several delivery drivers. And, as such, you are held in high esteem by your employers. Hence, I'm sure they'd be reluctant to lose your services. If, however, you were to explain your reasons for wishing to leave - i.e., I take it, to be in order to emigrate to your wife's homeland - then ...... there's not really a lot they can do about this decision,
other than request you to serve a statutory period of notice required for someone of your grade. Which, of course, they're entitled to expect anyway.
Secondly, I imagine at your level of seniority, you'll be superannuated ... meaning your occupational pension might be affected in the event of early retiral. Again, though, this would, undoubtedly be determined by how long you've worked with the firm to date.