But while the 27- year old actress daughter of Dame Diana Rigg is busy starring in a play in London, viewers can catch her on ITV1 in David Jason's feel-good drama, The Final Quest.
It's the third 'Quest' so far and clever direction from David Jason brings to life the adolescent antics of Dave, Ronno and Charlie when the old gang reunite and reminisce.
David has previously said that some of the action is based on his own youth. He stars as Dave in the story and his younger alias (played by Greg Faulkner) is a dead ringer for the multi-award winning actor.
Says Rachael: "The first time I saw an episode I thought David had dubbed it so that it was his voice. Greg's such an amazing mimic."
She adds: "This is the the final piece of the story. My character Annabel and the boys start a band together. The three lads all fancy her."
Joining Greg as young Dave are Ronno and Charlie (Max Wrottesley and Jim Sturgess). Hywel Bennett and Roy Hudd join David to play the older men.
Despite having acting in the blood and having already starred in well known dramas such as Poirot, Marple and Tipping The Velvet - which earned Rachael a lot of column inches due to its racy and explicit content - Rachael says she still has a lot to learn.
"Mum is part of my life and who I am and what I am so I don't hide from it. I'm hugely proud of Mum a and we have our profession in common, which is great.
"Tipping The Velvet made me realise I need to keep learning and keep working in low-profile things so I can find my feet and become a better actress. "