I've tested various power bricks a while ago for my system and I got these numbers:
Seasonic 80w (SSA-0901-12) - Idle 21W, Load 48W
Meanwell 80w (GS90A12-P1M) - Idle 24W, Load 51W
FSP 84W (FSP084-DMAA1) - Idle 21W, Load 53W
Delta 90W (Got this one from a QNAP NAS) - Idle 21W, Load 49W
So I can recommend the Seasonic if you are looking for an efficient and reliable power brick. Not sure about the availabilty of this adapter in the UK though.
Thank you, that's an interesting list.
Most PicoPSU use a 5mm/2.5mm barrel power jack. I'm unable to confirm that the power bricks in that list have such a connector.
What power adapters are compatible with PicoPSU?
The Mean Well GS90A12-P1M is available on Amazon:https://www.amazon.com/gp/product/B00TD ... 2PVUTEQ410
...but its PDF says "ID 2.5 x OD 5.5"http://www.meanwell.com/mw_search/gs90/gs90-spec.pdf