Wiring Heatlink to boiler with 5 wires.

[davidb2002]

I'm hoping to replace my old heating control with a heatlink that came with the 3rd gen nest thermostat. As far as I can tell, it should be possibly to just connect the cables the same as they are. I have five actual wires, and a couple of the connections are 'daisy chained' (see photo). Anything else I might need to consider here?

https://photos.app.goo.gl/38YnPpEx9m9XMZqp6

[davidb2002]

furthermore, it appears that I can't fit two wires in the same connector, they are too big.