Abbington: I'm Sherlock third wheel
Writers Mark Gatiss and Steven Moffat wrote the part of Mary Morstan, John Watson's love interest, especially for Amanda, but she told The Scotsman it felt strange playing the character who comes between Sherlock and Watson.
Amanda revealed: "I remember doing a scene very early on with Martin and Ben, and I was standing in between them and I thought 'I really have to up my game, this is proper'. They really bounce off each other.
"When I was at the read-through, I remember watching them, and the chemistry between them is just amazing. They do have this beautiful relationship, so getting in between that - which is what Mary does, she becomes this kind of third wheel - was scary. Also, the fans love these two together, so I'm sure Mary won't be particularly liked by them, but I hope that on the whole people really like her, because she's a great character and she has some fantastic secrets."
Amanda and Martin have been together for 12 years and have two children. But she admits she was overcome when she was offered the chance to appear opposite her partner in hit BBC drama Sherlock.
She explained: "We were at Mark Gatiss' house when The Hounds Of Baskerville first came on the telly. Afterwards they went into the kitchen and were sitting talking about the next series. I went in and sat with them. It had been mooted that I would be in it, might have a little part in it. They were talking about who might play Mary and I was like, 'So, who are you thinking of?' and they said 'You'.
"I got very emotional because it just seemed so amazing, just such a gift."
The third series of Sherlock will air on BBC One soon.