Appletons have given great service -- the drinker I ordered arrived lovely and promptly, even in the middle of COVID lockdown. The drinker was a little fiddly to assemble -- there's a critical part that needs to be inserted the correct way round, which I failed to do first time round. A quick call to Appletons helped me realise where I had gone wrong -- so many thanks there!
Unfortunately, the mechanism for attaching the legs to the drinker is less than ideal (in my opinion). You have to screw some (provided) screws into the plastic, so that they "self tap" and create their own hole in the bottom of the bucket; however it is too easy to overdo this... and end up with a hole in the bucket where the screws wont grip anymore. I've ended up having to balance the bucket on one of the legs, which is less than ideal. This is probably "user error"... but it does seem like an easy problem to have.
Other than that... great!