Best way to paint behind fiddly pipes?

[thirdistheonewiththehairychest]

Attached pic of me attempting to paint a wall grey.

Any tips gratefully received!

https://www.diy.com/departments/goodhome-small-long-reach-paint-pad/5059340015439_BQ.prd might work

You need a radiator brush. Like these, but your local DIY store or hardware shop should have one:
https://www.amazon.co.uk/ROLLINGDOG-Radiator-Set-3PC-Brushes-Ceilings/dp/B0C5WZ5S15/ref=asc_df_B0C5WZ5S15?mcid=1129c72e5a0d37d880ac89d34fcdebd0&hvocijid=4832572180718163848-B0C5WZ5S15-&hvexpln=74&tag=googshopuk-21&linkCode=df0&hvadid=696285193871&hvpos=&hvnetw=g&hvrand=4832572180718163848&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9214422&hvtargid=pla-2281435178378&psc=1&gad_source=1

Are you boxing in the pipes or painting them?