snakes alive!

Just had this message for a snake spotter-

Whilst walking today at 1pm in Eastcliff I nearly trod on a snake at least 3ft in length, green in colour, maybe a grass snake but looked online only 2ft in length this snake was at least 3 ft and 30mm thick, never seen anything like it in uk, please inform dog walkers as it may not be native to uk, looked online all day nothing like this native.