Hi, I'm searching for this one too. No luck so far I'm afraid.
Audible are releasing the first four Find-Outers books in February so fingers crossed they will make Holly Lane too.

I'm not sure. I'm pleased they are still making Enid Blyton audiobooks and really hoping they will do Five Find-Outers too.

New unabridged audiobooks of most of the Adventure series released on audible yesterday. I haven't bought any yet but the samples sound good to me. I hope the link works! https://www.audible.co.uk/search?ref=a_search_l1_publication_date_0&pf_rd_p=ff83f79f-3ec9-4d26-81d0-a70cf6f8e4e3&pf_rd_r=...