Why don't you stick it into an equity ISA with unit trusts and have all dividends reinvestedt.? As your retirement is 30 years away, an equity ISA should be a far better long term bet than a cash ISA and you won't pay any tax on it. You could also stick it into a personal pension and forget about it. However, it would be difficult for you to get at it in an emergency, so I'd opt for the ISA route. . It will build up over the years, and if you're made redundant in later life you may well be glad you tucked it away to one side.
If on the other hand your new pension scheme is a Final Salary Scheme, your final pension will be based on your number of years's service as a proportion of your salary and if you stay there for less than 2 years, you'll end up getting your own contributions back for a second time. So for that reason, an equity ISA still makes sense.