receiving the rents gross is a cash flow benefit to you. remember the Uk will deduct the standard amount of income tax from your monthly rent, which may not after 12 months add up to your actual tax due. expenses of letting are similiar to that of Ireland.
regardless you're going to have the register in England, the letting agent will push you in the right direction. you'll still have to submit a UK return and tax if payable must be paid. but you do get the credit when submitting your Irish return.
the Uk returns are easy to understand as they really go into depth of what exactly you must fill out. so taking on a Uk accountant may not be necessary.