I see BK Windows are now sponsors of the forum, Kevin at BK refurbed all of my old and leaking windows some 4-5 yrs back and between him and Paul (Swancraft/Shadow boats) they did a great job. The work was water tight and neatly done first time and I havent had one leak since. For those that dont know Kevin he has a wealth of knowledge collected over many years. Single glazed, double glazed and tinted so well worth talking too.