Update:
I bought the Tado starter kit and it arrived yesterday afternoon.
Connecting the bridge up to the router was very easy, no special skills required.
An electrician was on site, and he showed me how to dismantle the old thermostat, and more importantly, which wire was which! So I had a Phase/Live wire [grey], a NO (Normally Open) wire [orange] and a Neutral [blue].
Mounting the Tado backplate was pretty easy - you can either stick it on with the provided double-sided tape (i did this initially) or screw it into the old holes/make news ones with the gubbins provided. I eventually ended up screwing it into place. Everything inside is labelled well, so it was easy to match up where the wires went.
This is where stuff got a bit complex - my old thermostat was in their knowledgebase, however, my boiler apparently wasn't, so i had to stop the online process and call an advisor (in the UK, ouch). It took a while, but he was able to allow me to bypass the online boiler setup (mandatory, annoying) and then helped me to connect my Tado to the Tado bridge, this took a long time for some reason, but we got it done in the end.
The phone / web browser functionality is great and you can register multiple phones, so it knows if anyone is home, and if not will allow temp to fall, until your phone comes within range again, when it will begin to heat to your desired temp. Alternatively, you can just put it on a timer...still playing about with all the options.
I have ordered 3 of the additional thermostat units to replace the other 3 analog thermostats in the house, but they are only shipping from November onwards, so I guess I'll report back then! So far though, it's a thumbs up from me...if I managed to install it on my own, anyone can tbh.