I am quite confident on the basis of your description of your circumstances that you are non-domiciled and will remain so - even if you die in Ireland - unless make a positive effort to adopt irish domicile. The only doubt might be if your father was Irish-born, as you inherit father's domicile at birth and you may not have lost this. A good way of cementing matters is to make a will stating your domicile, declaring that the will is under the law of your domicile, and that you intend to die there. ( eg "I intend to return to Enland when I retire/my wife dies/ etc").
You can import capital from jersey tax-free, but not interest. You need two separate accounts,to make sure that your interest on the capital account is credited to a second account, which you leave untouched. Otherwise a withdrawal from from a mixed account is treated as taxable interest first, then capital once the interest element is exhausted.
You may also need to register your tax-free status with the Jersey bank, otherwise they will have to deduct EU witholding tax.