Ronseal decking protector (Bellevue EH7)
Most of a 5 litre container remaining, though the lid is a bit difficult to remove without risk of damaging it, so I can't tell for sure. About 3 years old. Full room would cover about 15 to 20 sq metres with 2 coats. Apparently does what it says on the tin.
This offer has been gifted to someone and is no longer available.