How do you have google WiFi?
It is not sold in the U.K as far as I can tell?
It sounds as though you somehow got your hands on the American version?
If you are using an American Google WiFi device in the UK please note the device is likely in breach of the allowed transmission power (EIRP) in the UK. Transmit power on 2.4Ghz is 100mW in the UK, whereas in the US it is 1000mW. This would explain the sudden miraculous improvement in your wireless reception.
The challenge with using equipment this powerful is that it can cause excess interference for all devices which are operating nearby at the UK limit.
At 5Ghz, in the US higher channels are allowed e.g. Channel 161, in the UK you can only legally use band A and B channels by default... anything over channel 140 needs to be licensed. A US router will default to channels not legally ok to just use in the UK, and what is worst it will potentially broadcast on these channels at an output power not legally allowed either.
You risk interfering with RADAR systems in the UK which is why UK wifi devices have DFS built right in. Also some wireless cards which have European drivers are programmed to only look at the UK channels, with time you may find some devices do not even see your wireless network which could be a headache.
My advice if you are using a US device is to try and get your money back and return it in the returns period.
Edited by ukhardy07 (Wed 28-Dec-16 23:11:27)