WoW.... can you forward her details please.
She's a treasure. Our first boiler service chap was an older guy who was ex British Gas. He had to eventually give up work due to heath issues. He recommended Lois who had been his apprentice and she's been looking after our boiler ever since.
We have a conventional Glowworm boiler that's nearly 25 years old. When I queried replacing it she said she could sell me a new boiler and install it, but recommended never getting rid of the existing one.