The Croydon store is off of Purley Way not in Purley (I'm sure you knew this already). The area can be a nightmare for traffic, especially at the weekend. So if you really wanted to visit there, best go during the week if you can. Easy to get to by tram though but of course if you're buying anything bulky then that's out.
Yeah I know it's not in Purley but on the flip side you got the lovely A27 through Worthing![]()
Croydon. You can avoid atop the traffic by using the A217.