The original BR hand dryers were utterly asthmatic and useless, particularly those installed in the Turbo fleet (and sadly still remaining in the 166s.
Both toilets on 158s seem so outdated now.
The toilets in the Turbo fleet I have to say were worse. Anything from the ridiculously rubbish cupboard door which often swelled at the bottom, to the sink with its smooth edges which allowed water to dribble over the edge and end up on the floor.
Seems to be a Bombardier thing, as the luggage racks on the Voyagers are worse (then again so is a lot of the design on those), thanks to the ridiculous curved ceiling panels. Speaking of the *Stars, the silly use of a one size fits all Reading light set up in the overhead luggage racks annoy me - they may be fine for some seating layouts, but look silly for others.
Speaking of the toilet / hand dryer areas, here is my two;
ScotRails Haymarket / Corkerhill 158s. The recent refurbishment, while welcome in bringing them a little more up to standard, has also made them worse. The seat spacing has been reduced, particularly at the table seats, so you end up playing footsie with your opposite passenger. The plug sockets seem inconsistent between USB and Plugs. And in the toilet, they’ve put a hand dryer above the push button for the tap, so every time you go for the tap you turn the dryer on instead.
And… the IET / 80X / 385 toilet design. The heavy sliding doors, the silly locks placed near to the sink, the sink / tap design which lets the water end up on the floor, which seems to have lead to a lot of floors bubbling up already. All a very poor design.