Knew this rang a bell! I got involved in the same query four years ago at
https://www.british-genealogy.com/archive/index.php/t-70860.html?s=d21bdf89e31567fbd690c554bca1b1f0 We went over the same ground without reaching any conclusion!
Sturtly and Smedley aren't Beds place names and I'm not thrilled about them being a phonetic Streatley as there are no Gurney events there anyway. I've been through my list of Beds parishes and hamlets and there's nothing else that looks to be a possibility. John has just ruled out Clophill, which I never fancied, and Lizzie thinks the Aspley (Not Apsley) Guise baptism is the James in Husborne Crawley in 1851, with which I concur.
Which leaves us precisely nowhere.
David
PS I've crossed in cyberspace with Lizzie's post, so I'll add my comments as a PS. It wouldn't be Stewartby which wasn't built until the 20th century for London Brick Company workers and was named after the Stewart family who bought LBC in 1920. Sturtley End must be a possibility, and whilst there are no Gurneys in Ravensden there are in nearby Renhold, so I wouldn't rule it out.