Not sure if you are pulling my leg bibblebub, and maybe I have lost my sense of humour tonight watching the match.
The search was done on "place for filming" taken from the clue. The first few threads related to this crossword clue. I think the QI thread was picked up because it included the separate words PLACE and FILMING.
So many duplicated Crossword questions could be avoided if more people tried the Search facility first
it's not you, the 5th entry down on the search page for which you have provided the link is what I referred to, and I was just wondering why the site search should have found that particular question
Thanks bibblebub, dr b, shaneystar2, factor30 - I did check AB earlier but 17across did not come up. Anyway very many thanks everyone - obvious answer once it's pointed out!