I was once on a yard where a lot of these horses passed through, and generally they have wonderful temperaments, as long as they are not overfed and have some sort of stimulation, same as any horse. A horse that is good in traffic is a must on today's roads (especially with sat-navs sending lorries down roads they have no right to!)

Hope this turns out OK for you, and don't be too proud to ask for help if needed.