Poorly Himalayan Honeysuckle

Hi, this is my first time posting, I am a very inexperienced but enthusiastic gardener 


I live in Derbyshire, this is a south facing garden and the plant is near the top of the garden. Not sure of the type of soil, sorry.

I have What I believe is a Himalayan Honeysuckle that has flowered prolifically in the past but looks very sad this year
I did snip off some stray branches last autumn (as I have in previous years) because it was getting so full and bushy, but must’ve done something to upset it.

My neighbour also has one and theirs is lush:
That’s how mine has looked before but this year it just looks a bit bald and fed up with hardly any flowers:

That’s how mine has looked before but this year it just looks a bit bald and fed up with hardly any flowers:


I live in Derbyshire, this is a south facing garden and the plant is near the top of the garden. Not sure of the type of soil, sorry.
Any advice would be appreciated, I wondered if I should cut it hard back at some point in the hope it gives it a boost?
Thanks for reading my post.
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I wondered if maybe next door might’ve put something down that it’s accidentally soaked up... their garden was hard landscaped and they’ve done some remodeling but not directly where this plant is.
It's very close to your fence. This may have sheltered it from the rain and the concrete will have soaked up some water too.
Do you know if it will take a hard pruning? Wondered if that might reinvigorate it next year maybe. Thanks.
Here's some more advice
https://www.gardenersworld.com/plants/leycesteria-formosa/