I had a support discussion a day or two ago about whether or not the 2am to 6am cheap rate period was always in GMT, or whether it was in BST during the summer. The response from Bulb Support was quite clear that it was always in GMT.
However, I checked my meter at 06:50 (BST) yesterday, and found it showing Rate 1 as the active rate. This would suggest that it had already switched back to day rate before 7am BST (which is 6am GMT).
This shows that my meter seems to be applying the 2am to 6am times in BST, not GMT.
In any case, please can Bulb clarify this in their tariff description so that it is crystal clear to all EXACTLY when the cheap rate applies in both summer and winter.
If I get this wrong and set my car to charge wrongly by an hour, it will cost me roughly £1 per charge with a 7kW charger.