Infertility patients are not getting the deal they deserve from clinics and those who need donor sperm or eggs are being "sold short", the head of fertility regulation in the UK will say today.

Patients rate many clinics highly, but in the year when the 100,000th IVF baby has been born in the UK, there is still much to do before all those who need help to conceive get a satisfactory service, Dame Suzi Leather, chief executive of the Human Fertility and Embryology Authority (HFEA), says in a speech at a National Infertility Day event in London.

Dame Suzi says the needs and expectations of patients have to be at the heart of infertility services, but that in several ways they are being let down. More than a third end up paying more for their treatment than they expect, she says, and almost a fifth of patients, asked to rate the service they received from their clinic, gave it a score of less than four out of 10.

She voices concern about the supply of donor eggs and sperm. It is not true that the government's legislation to remove anonymity from donors - so that their genetic children can find them in later life -is the reason why donations have fallen off. The process began before the change in the law. "I think the big question is what are the clinics doing to tackle the problems of supply? They are the ones responsible for recruiting donors," she says.

Dame Suzi calls for the government to fulfil its commitment to fund more fertility treatment on the NHS, which is outside the remit of the HFEA. She also pledges to work to end the varying standards in the clinics, so that they are all equally good, whether in the public or private sector.