I've wired up my patch lead per the wiring instructions above and while I can make outgoing calls, the phone doesn't ring for incoming ones. I've assumed that "BT2" etc is the same as the second contact in from the left when looking down onto the BT plug with the latch on the right. Equally, "Patch Panel 4" etc is 4th contact from the left of the RJ45 when the latch is underneath and the contacts are a the "top".

Any ideas why the phone doesn't ring? Have I wired my plug wrongly? (I've continuity checked my patch lead just to be sure)
I think you have the BT wiring reversed.

BT1 is nearest the tag so looking at the plug with the tag on the right it goes 654321

For the patch panel, follow the T568B colour code (the one with the orange pair on 1&2)

RJ45 plug is 12345678 with contacts up and latch underneath.

Regards

Keith