Also, once I have done this and have the wireless thermostat connected, Do I just keep the integrated mechanical timer on constant rather than disconnect it and I can programme the times and temps from my phone.

Honeywell Home T6360B 1028 room programmer 240v 10a | Wolseley

A digital replacement would almost certainly be a good idea anyway, and the world is your oyster. Your current stat is mains powered, so you have the complete range of mains or battery-powered options open to you. The only way to confirm for sure, would be by knowing what is connected to the other end of each of the wires. Unfortunately the colours of wires are meaningless as they would have been chosen by the original installer and as earlier posts show some don't always make a sensible choice. It's what is connected to each end of a wire that determines its function, not the colour of its insulation. The wire isn't connected to anything useful at the other end and terminal 4 has just been used to 'park' the wire. Can someone give me advise on the best way forward. Do I simply disconnect these two wires from terminasl 1 & 2 within my boiler and then connect the wireless receiver as per the Tado instructions? I assume I would then need to disconnect wires from the thermostat itself? Happy to provide pictures of how the thermostat is connected if required.I bought the starter kit thinking the thermstat could be wired in to replace my Honeywell.... The fact it's wireless thermostat wasn't a big enough clue for me.

Honeywell Home T6360B Room Thermostat T6360B1028

That does sound like a faulty 'stat all right, tho' I guess other things could cause similar symptoms (tho' not sure what!) lots and lots of options, from the Honeywell DT90e, but I'd suggest you consider a programmable stat since you are going this far. These will take care of both the temps and timings, so' they'll run yer hoosie. With an easy-to-use dial interface, the Honeywell T6360 allows users to adjust the temperature according to their preference. It also has a variable temperature control range from 10 to 30 degrees Celsius, and a switchable voltage operation between 220 and 240 volts, making it compatible with most types of central heating systems. With its compact and unobtrusive design, the Honeywell T6360 thermostat blends seamlessly into any room decor. It is built to last, with quality materials ensuring durability and reliability over time. The Honeywell T6360 is a programmable electronic room thermostat used to control heating within a domestic or small commercial environment. It works by measuring the air temperature within its location and then maintaining it at the level set by the user. This thermostat is designed to improve overall energy efficiency by allowing users to easily control the temperature of their space.

However, it's unusual that there's a wire connected to terminal 4. This terminal is only made live when there is no demand for heating, so it could mean: The T6360 thermostat is compatible with a wide range of heating and cooling systems, including gas and oil boilers, electric heating systems, and air conditioning units. It can be easily installed and wired, making it a convenient choice for both professional installers and DIY enthusiasts. A room thermostat controls the heating in your home. If the room's temperature drops below your chosen temperature, the thermostat will switch on. Once the room has reached the chosen temperature, the thermostat will turn the heating off, preventing overheating and reducing energy consumption. This can help reduce your home's energy consumption. At the moment I guess your timer is mounted on the boiler, so that does things like switch ON at 7am and OFF at 9am and ON at 5pm and OFF at 11pm, for example? I have looked at how to connect the wireless receiver to the boiler and my first issue is that the instructions advise that there should be a bridge between terminals 1 & 2 - There are actually two sperate wires in these terminals which I understand to be from my thermostat supply in terminal 1 and switch in terminal 2.