When I was browsing through the Wish app on my iPhone, a shopping app tailored to the things you like, the exact same dupe sunglasses came up for £3 and £1 postage and packaging. I ordered them March 1st 2016, and received them on the 24th March 2016. They of course came from overseas, China I imagine, like most items on Wish do and 20 working days is about the average for items from there to the UK.
Obviously, for £3 I am not expecting a direct replica.
The text is slightly splurged and uneven, but they look fine and the text isn't unreadable. The House of Holland originals can be bought in pink but the classic style is black with lenses that are slightly tinted purple. The inner is white, the same as my dupes.
The inside is well made and the hinges close and open easily, they're not flimsy but not over stiff.
They even came with a sturdy zip case!
You can buy them here.