Critically ill grandmother Sharon Berger has received a bone marrow transplant, in the culmination of a four month campaign to find her a donor.

Following the transplant on Thursday, her son Jonni Berger said “all is going well so far”.

Ms Berger, 61, from Harrow, suffers from a malfunction of the bone marrow in producing cells. She has been in hospital since December 2012 and following a lengthy campaign by family and friends to find a bone marrow match, a donor was found last week.

Jonni Berger said: “I think it's likely she will get slightly worse before getting better and it may be several weeks before we know whether it has been successful or not. We are all hoping it will be.”