@cockney_dave
Those links probably work, but it isn't going to help you any... If you boot 1.3 on an A1200 you lose your IDE controller, and hence your hard drive. WHDLoad won't be much good when you don't have a controller, let alone hard drive visible to your current configuration.
AFAIK there is no way around this problem, other than to use an emulator or an A500/2000 with HD.