OK, I've followed what I think you said, but the system with the Drayton LP522 hasn't fired up.
Looking at the connection instructions that came with it, it shows the back plate with four connections on N,L 3 and 4, this, I think is what you said.
Now the difficulty. It shows a junction box LWC3, obviously I'm not using this, I don't have one. It shows 3 going to position 7 and this goes to the boiler live. I follow that.
Now the pump, (that is the chart showing the pump) I shows the L going to 5 on the junction box but not where 5 goes to the controller. It shows N going to the common N, no problem, but what goes to 5 in the junction box? Should they have indicated 4 on the backplate going to 5 in the junction box not 4? This seems to make sense to me.
I can obviously create this junction box and put it in a small ABS enclosure, I imagine you would suggest this.
The chart shows all the Ns together rather than the Ls as I interpreted you advised, so do I just need to change this round and connect it as they show but using terminal 5 in my created box as the connecting point for the pump live?