Yes the wear and tear allowance is available but the taxpayer may choose instead to claim capital allowances on the furnishings as the holiday lettings are viewed as a trade.
Not entirely certain about the meaning of your statement but there are indeed different rules within property income to deal with the different types of property income – unfurnished, furnished, furnished holiday lettings let alone premiums received on the granting of a short lease. In this issue capital allowances in relation to furnishings is only available for furnished holiday lettings.