I have seen it Ladybird ... I would not think it is up to Tamaris to be the installer's secretary. He has a responsibility to factor in these follow up checks into his work schedule during the warrenty period. It is part of the dealershop networking agreements that these installers and suppliers run. These heating engineers get very nice discounts for "recommending" boiler manufacterers, and fitting them to specification guidlines with warrenty support is part of that deal. No manufacturer wants a bad name because of a bossy or beligerent fitter. I would have thought it was his brief to contact Tamaris not her responsibility to remind him. He also has a service record log, that is kept by the customer, that he is supposed to sign and fill in. It includes the date of his next scheduled service call.