Underfloor heating when the manifold is far away from the boiler

[DynamicCarrots]

Hi all,
I am planning on doing a wet DIY underfloor heating install downstairs of my property.
I have zero experience with the plumbing and electrics side of the install, I plan to get a pro in to hook everything up but want to ask a question to make sure I have not missed anything prior to their visit.
I have attached a diagram of what I think in my head is correct, but open to suggestions here.


I have radiators upstaris for now and plan to do a underfloor system when I renovate the upstairs of the property.
I plan to have 2 nest therostats, one upstairs and one down stairs ( its a small open plan property )
The upstairs makes sense to me, the Nest Link will tell the 2 way valve to open which will also tell the boiler to switch on.
However the down stairs is confusing me, the Nest will tell the 2 way valve to turn on, which will tell the boiler to turn on but what tells the underfloor pump to swtich on in this sinario.
Idealy I am trying to avoid running a cable to the boiler as the boiler is in the loft space and will be a royal pain.
Any advice would be much appricated.
Many thanks

 

[muggles]

You could use an RF Mainslink to create a switch live at the manifold

 

[DynamicCarrots]

You could use an RF Mainslink to create a switch live at the manifold

I was hoping someone would suggest a wireless solution, do you have any recommendations for cheap yet reliable brands?
Are there any downsides to using an RF link here?
Thanks