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Plumbing is a skilled trade in the UK and the recognised path is an apprenticeship combining FE college with paid on-site work. After 2-4 years you finish with an NVQ Level 2 (then Level 3) in Plumbing and Heating that lets you work on water and heating systems. To work on gas appliances you must additionally qualify and join the Gas Safe Register.

Plan around the qualification first. Once you have your NVQ Level 3 you can work unsupervised; if you want to work on gas, the Gas Safe Register (via ACS assessment) is the essential next step, and it's a legal requirement for any gas work.