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Moved into New House with Tado - how to connect to extension kit?

I have spent 2-3 hours on piecing everything together on moving in today and think I am nearly there. The house has a Tado thermostat, internet bridge and extension kit. The boiler is an Ideal Icos He12 which I believe is a 'combi' boiler. I have downloaded the app and registered my thermostat and internet bridge device, both are working fine as far as I can tell. I am coming short at connecting the internet bridge device to the extension kit, wired in near my boiler. I have followed the online instructions (put internet bridge in pairing mode, hold don extension kit button 3 seconds). The extension kit tries for a few minutes in constant flashing mode then seems to settle to a default flash 4 times, then nothing for 2-3 seconds, then flash 4 times (which I cannot seem to find anywhere what it indicates). Where do I go from here, to connect my tado system to extension kit? I believe this is the next step to connect the system to my boiler and then be able to control heating and hot water