Nest installation- 3rd Gen - 2nd opinion

[M_b]

Hi

I am handy with electronics but wanted a second opinion before I go ahead and install the 3g Nest Thermostat.

Heat link:
In my existing timer set up, where I plan to install the Heat link, I have wires coming into N, L, 4 and Earth.

Also, there is a wire going from L to 1. Do I simply attach the same wires to the Heatlink?

I believe the hot water is heated communally so it is not linked the timer.

Nest:

There is a separate thermostat, here there are wires going to 1 and 2. Do I connect the same wires to T1 and T2?

 

[M_b]

 

[M_b]