Travelling in London and keep losing data network


I'm currently travelling to London UK and keep losing the data connection. It was working fine for the first day, and then I noticed I had a full reception but no data.I have restarted the phone and no change. I managed to manually select a provider to get it working, but when I let it auto select the carrier I get either no network or GPRS via the EE network. Only 3, O3, or Vodafone seem to offer LTE, but these dont seem to work when I let it auto select.

Please help. Phone is iphone 7, latest ios. I have travel pass enabled etc.

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