First vertical £5 and £10 notes to enter circulation. National vocational qualifications (. Trainee plumbers in scotland can take the four-year modern apprenticeship in domestic plumbing & heating scottish vocational qualification (svq) level 3. Our combined experience of 25 years gives you piece of mind that your new boiler is being installed by professionals that are passionate about what they do. We've scrutinised 196 policies to find out which companies combine.