Hi Sy,
We run at our centre a 2 week full accredited plumbing course. It's a level 2 qualification that you get, and is aimed at domestic wet plumbers / bathroom fitters.
We also run 1 day BPEC Water Regulations Training, which is what you need to secure contracts with the council/housing associations/commercial etc.
With your qualifications, this is all you need
Plumbing Courses from Chase Plumbing Academy