Steve Barber and John Taylor were climbing Mont Blanc to raise money for St Leonard's Hospice.
Its director of fundraising, Janet Morley, said:
We are devastated to hear of Steve's death and the deaths of John Taylor and Roger Payne, as well as of the other victims.
Our thoughts and prayers are with their families and friends today."
A memorial service has been held for nine climbers, including three Britons, killed in a huge avalanche in the French Alps.
The families of three men who were killed in a major avalanche in the French Alps on Thursday have paid tribute to them.
Two survivors of the avalanche which killed nine climbers, including three Britons, describe the terrifying moment they were swept away.