Shaun,
If you want to set a maximum order value, so the shipping module turns off after a certain amount is in the shopping cart, it can be done like this:
1. Open the file for the class of postage you want to turn off.
(In this example I will use 1st class and turn it off after ?30.....)
2. Locate the line:
ff ($order->info['total'] > 250) {
3. replace this line with:
ff ($order->info['total'] > 30) {
4. Save and re-upload.
of course, you can do this in all modules, some are set differently anyway, so just search for:
ff ($order->info['total']
In each one and you will find the area where you can change the maximum.
I hope you all like this, I must admit, this is my first ever contribution, so it may be a little rusty around the edges. Later I will update the download pacage to include both spreadsheets for grams and kilograms, so you can copy and paste the strings as necessary. Let me know if there is anything else I can help with on this.
Mark