There is a great accordion sales and repair shop in Darlington "Geoff Holter Accordians" He renovated on old Gerrini for my daughter and it was like new! he does everything from tuning to making new bellows in house. We have bought several Vignoni accordians from him which are superb! He also always has some second hand boxes in great condition - and you don't get any Bull like some other retailers
Hope This helps