I would like to thank everyone who answered my post regarding my situation, as an update i think i have managed to nip the problem of rats under me shed, in the Bud
I went and got another 2 rat snap traps so four in all baited all of them, where the rats were seen, managed to get four rats, so rebaited them and nothing and thats been about 2 days after me first post 19 jan 2020, so around 3 weeks i also got rid of the water and bird food including the feeders and there has been no activity so i assume they must of packed their case's and moved on, The traps are still in place and baited just in case and i keep looking and with the recent snow fall saw there were no foot prints in the snow so i assume it could be problem solved.
So i think i would like to close this post and say thank you once again for the reply's.
Regards Tony