That's great, thanks so much! If I find more like this (I use CityStrides when I'm running so am always coming across private roads I can't go down) I will know how to deal with them in future. Really appreciate your replies!

Hi, sorry, I am new to this! The gate is a bit inside Albert Avenue – it's very visible here, I don't know if that helps: https://www.google.com/maps/place/Albert+Square,+Stockwell,+London/@51.476911,-0.1188561,3a,75y,65.72h,98.93t/data=!3m10!1e1!3m8!1sShf_CpGmJJAPUb5Pq598Pg!2e0!6s%2F%2Fgeo0.ggpht.com%2Fcbk%3Fpanoid%3DShf_CpGmJJAPUb5Pq598Pg%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D42.676456%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192!9m2!1b1!2i45!4m5!3m4!1s0x487604f4938e72b3:0xc4b4021f67aa121d!8m2!3d51.4770415!4d-0.1191557