I work full-time in Ireland, but will be doing 6 separate weeks of work in UK. How will this work be taxed? Do I declare to both UK and Ireland Revenue that I am working like this? I have contributed to my UK State Pension over the years, and hope, in addition to the money I get from the work, that I it will keep my UK State Pension going after Brexit, with maybe still some top up from me. Is this workable also??