Assuming that you are a US citizen/resident, owning a property in the UK as a "second / vacation home", you should be able to deduct on Schedule-A the property tax ( or equivalent ). If however, you choose to use it as an income property, then the property tax etc. would be declared on Schedule -E., as an expense against the ( at least fair market value ) rental income. If you have any mortgage interest payments on the subject property, it will be treated exaactly the same way.
If you are not a resident ( at least for tax purposes ), then there are other items to consider.
