I'm nearly 47 and desperate to be a mother by 50. I've spent over £40,000 on fertility treatments and have lost 4 stone - and my partner - to have my miracle baby...

Most women, whether they want to become a mother or not, are aware of the ticking of their biological clock. For some it is easily ignored, but for many it starts to sound louder at 35 and deafening by 40.