234 10 21491 6541

2G 900 only site for O2. No evidence to suggest Vodafone is on this site, constructed by O2 pre-Cornerstone (has to be before 2005 because judging by data on mastdatabase of sites in the area, this site shows up as MM02 MAST CHOSEN HILL, GLOUCESTER, GL3 2LG; wasn't able to find any planning applications either (I suspect the postcode displayed is wrong). Attached an image of masts in the area on O2 My Network for further evidence.

Picture of two telecommunications towers from Google Street View and a Severn Trent Water facility
Shows picture of O2 site on the left and picture of shared EE and Three towers (as well as DAB+FM transmitters; used to broadcast Orange from around the mid 90s) on the right (Credit: Google Street View)
Two masts on a hill surrounded by trees
Picture from open field below (near some houses), EE+Three+FM/DAB site on left, O2 site on the right (taken at 20x zoom on a Google Pixel 6 Pro)
Image of a map on O2 My Network showing a mast up near the peak of Chosen Hill and a mast further down (eNB 104117l

Site seems to only use this one ID based on information I've been given. 3G/4G is unavailable from this site, but eNB 104117 provides 3G 900 and 4G 800 + 2100. Thanks @RajSandhu2K for some of the information.