Hundreds of families block organ donation Organs from 505 registered donors could not be made available for transplant in the last five years because of objections from relatives.
BBC 5 live found that almost a third of families blocked organ donation because they felt the process took "too long".
The law states that consent lies with the deceased, but in practice, relatives' wishes are always respected.
The NHS wants to reduce the number of "overrides" by encouraging prospective donors to talk to their relatives.
In England, NHS figures showed that 457 people died last year whilst waiting for an organ transplant. BBC News