On the UK property information form for a house sale there is a question that asks if the central heating system is in good working order. Our solicitor has altered our reply from "yes" to "not known", as she says our answer implies a guarantee and warranty to the buyers, and therefore it is inappropriate for us to answer "yes". We have our boiler serviced once a year and when we turn the system on it works and the radiators all get hot. Is our solicitor giving us good advice? I'm concerned that to our buyer it will sound like our heating system does not work.