If you are paying tax, there is a wide range of reliefs available which may reduce the amount of tax you pay.
Health expenses (unrecouped), incl. nursing home fees, doctor's or physiotherapist's fees, medicines etc. paid in respect of yourself or your family (at standard rate except nursing home fees in 2010).
Incapacitated Child Credit can be claimed in respect of a child unable to maintain him/herself due to physical or mental disability.
Employed Person taking care of incapacitated individual - can be claimed in respect of the costs of employing someone to care for you or a family member who is totally incapacitated.
Home Carers Credit can be claimed where one spouse stays at home to care for a child or dependant person.
Dependent Relative Credit can be claimed by anyone maintaining a relative (if more than one person contributes, the credit can be shared).
Medical Insurance Premiums - Relief usually given by the insurer through Tax Relief at Source scheme. However, claims can be made if your employer pays some or all of the premiums for you or your qualifying dependents.
You may also be entitled to claim other tax reliefs and credits, for example: Age Credit, Rent Tax Credit.