As long as they're in full sun and well drained soil they can cope. I had a lavender hedge at the top of a sleeper retaining wall in my Belgian garden and it coped with periods of -25C several winters in a row and lots of rain and snow too but a bit warmer at -10 or -15C.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
I agree with @edhelka. The flowers also looks too pale , Hidcote is quite a rich deep purple rather than “lavender” colour
If you have a garden and a library, you have everything you need.”—Marcus Tullius Cicero East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
I was at a nursery today and what they are selling as Hidcote matches the description given by Butterfly66. I think I'm a few years too late to demand a refund, even if I could remember where I bought them.
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East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham