Changes

Head to London Road and walk all the way down it until the roundabout. There isn't really any place for cars to pull in (no layby) but walk down a little and cars will be able to see you and pull in if they desire. From this Roundabout you will get a lift to Junction 18 of the M4 - the motorway onramps (East or West) have plenty of space for vehicles to pull over. Using a sign here could take you a long distance in either direction (including North up the M5).