Kingscote barn is situated 15 minutes from Junction 13 on the M5 and 20 minutes from Junction 18 on the M4 and is easy to find.
There was no visible public transport to the venue although but there is ample car parking. Kingscote Barn website

Accommodation

Spring Cottage is tucked away just two minutes walk from The Kingscote Barn with a stunning view down the valley.
The cottage comprises two bedrooms each with a double bed, bathroom with over bath shower, living room with a double sofa bed, kitchen, utility room and downstairs toilet. There is also a small, private garden with a terrace.
The Tallet House is a brand new conversion located on the first floor adjacent to the barn. There are two en suite double rooms, linked by a landing, both with exposed beams and lots of character

General summery

Kingscote barn is clean and airy as well as well managed, The food service is good but this may differ from suppliers that you are restricted to by the venue, It also seemed a little rushed with the evening food being available for a short time (Note that food left for too long is also a bad). The bar is small and situated in a small room but is reasonable stocked and priced.
The registrars are from Stroud's registry office and are nice people to work with.
From a photography point of view
The venue is bright and allows better natural light than some other barn venues, there is a large glass wall in the main entry area with a high ceiling and exposed beans, the main wedding area is also bright and with the gallery it allows for a different aspect to the photography. The lawn area is described by the venue as large and it is not, but it is not small and what could be considered a good sized houses garden. They also have a more ornate area just slightly away from the main building for photos, though at the time this was a little restricted with the car park being in the background (should no longer be an issue).