Mine's gone wonk. Don't think it's dry solder joints as they look OK. Can;t find anything that looks like it thus far.

I think you're in the UK, or i would send you my extra!

But i found one super cheap on amazon, thought the one i bought didnt have one, but ended up showing up with one

I had a look at a load on eBay and electronics spares places etc but none of them seemed to have the right shape or number of legs, even other Boss ones.

You got a link?

https://www.amazon.com/dp/B00VWK9I28?ref=ppx_yo2ov_dt_b_fed_asin_title

But I see what you mean about legs for the UK edition

This looks pretty similar to the one i got!

https://www.amazon.co.uk/Sp-202-Power-Supply-Replacement-Adapter/dp/B00F5VUJE6

The powers source i got above has a hella short cable, but significantly lowered the hum compared to the one that shipped with my 202

Nah, I mean the thing that you stick those adaptors into. The female bit on the SP itself, not the power supply.