The streets around Thornhill School, (Otto Terrace, Beechwood Terrace etc) are similar iirc. Google reckons 30mins walk from SoL but you walk past a few pubs or could jump metty to University then walk.Parking outside St Anthony's School in Ashbrooke is good for night matches (can't do it for home games as it's no parking between 2-3pm). It's close to town and about 20-25 mins walk from the ground.
As long as you come out avoiding Thornholme Rd/Durham Rd junction, which is usually very busy, you've got choices for getting away.