In view of her 670,000 followers, the maths whizz wrote: “Posting these in honour of @Nick_Hewer’s last ever Countdown filming day with us!!! @susie_dent.
“After nearly a whole decade, it’s not going to be the same around here without Hewer the Skewer!”
Many of Rachel’s fans flocked to her post to share their comments.
One replied: “All the best to everyone today, especially to Nick for his last day.