Re: should I sell or rent
Where is the holiday home? If it's in one of the ghost estates in the west of ireland or bulgaria etc. might be worth getting out while you can!
Also, as you have no mortgage on the first house you wont be claiming any interest expense. This will mean that a lot of your rental income (after other expenses) will be liable to tax, presumably at the higher rate. This should have a major bearing on your decision on whether its profitable to keep it.