Hi sorry it's late but I wrote to this address not long ago and got a reply, it's the address she says to use to get a signed photo in her Twitter,

Anne Hegerty
ITV Studios
Upper Ground
London
SE1 9LT
UK

Thanks

Hi I just wanted to let you know that I have also revived their autograph and it's slightly different so it's not a pp ! Congrats

Hi I wonderd did you just email them asking for it - did you not have to pay for postage ? Thank you