LOL at the poor grasp of numeracy.
I always believed that 10-15% was the normal range for winter losses in the UK so 13-16% is hardly a significant deviation from the normal loss rate.

I lost one 2 frame nuc out of 19 colonies I had in the autumn. I could have 40 colonies by the end of the summer if I wanted.
I am splitting colonies to give 5 to my BKA and I still expect to end the year with more than I need.

This is the key fact to get your head around. (no bold or underline needed.)

In the past 3 years uk colony numbers in the uk have increased from 40,000 to over 120,000 according to the bbka.
That is how badly our uk bees are doing. Numbers have tripled.
Who knows where they came from. Outer space maybe.

You can make a strong colony into 4 good nucs in August and have 4 full colonies by the following May.

I know one guy who keeps his bees within 2 miles of me who has had winter losses of 80-100% 4 years on the trot.
Why would that be when we share the same forage area, pesticides and pathogens.

Well I have a theory (unrelated to the brontosaurus)
I treat for varroa with Apiguard and Oxalic acid.

Last autumn my hapless beekeeping neighbour made up a potion with camomile tea.
The year before it was a different potion and the year before that another beekilling useless potion.
The same bloke likes to rant about how pesticides are killing our bees.

Personally I blame the tea.