As the UK's blood cancer charity and bone marrow register, we were concerned by last night's episode of the BBC One sitcom Over to Bill, which included what we considered to be an inaccurate and poorly researched plotline about bone marrow donation which could inadvertently undermine our efforts to save lives.
Despite what was doubtless intended as a lighthearted plotline recognising the selfless act of bone marrow donation, the scene unwittingly reinforced several myths about the process.
Far from being the invasive procedure that is depicted in the episode, joining the register involves nothing more than filling out an online form and spitting into a tube.
Watch our animated guide to becoming a bone marrow donor
Most people who join the register will never be found to match for someone desperately in need of a lifesaving transplant, as there are thousands of different tissue types out there and we need to find the best match possible.
But for those few who are asked to donate, the vast majority (90%) do this by giving their blood stem cells rather than bone marrow itself.
This is done via a method that is very similar to giving blood. It doesn't involve a general anaesthetic or even an overnight hospital stay, and we are constantly told by our amazing donors that, despite it being such a simple act, the feeling of giving someone a second chance of life is a huge and life-changing privilege.
We have now been contacted by several of our supporters - both donors and transplant survivors - who fear that the portrayal of bone marrow donation in the programme could deter potential donors from joining the register and deprive someone with blood cancer from a lifesaving match.
Even those who, after watching the programme, do want to sign up, will be left in some confusion as to how they can go about this.
As we can currently only find a match for around half of the people who need a bone marrow transplant, we urgently need to educate people about what it really involves.
Read our facts and frequently asked questions about donating stem cells.
We will be writing to the BBC to take forward our concerns and those of our supporters.
If you would like to contact the BBC directly, go to https://www.bbc.co.uk/complaints