Agency for labourer/construction? South London

[1newname]

My son is 19 and really struggling to find work. He's applied for loads of pub jobs but no luck. He'd really like to start as a labourer as construction is something he's interested in but it seems to impossible to find anything legitimate online. Does anyone know of any proper construction agencies in South London?? Thanks

https://www.bluearrow.co.uk/jobs/431916-Plasterer/

Blue Arrow are a good agency.

Can he speak to the job centre to get his CSCS card, which many require to get a job on a site. It is something they should fund / signpost to, as cheap. Ask for them to fund from their flexible funding. https://constructioncertification.co.uk/london-southwark-citb-test-centre

He's just got his CSCS card himself