I've been a customer of A&A for a few years - I had the same reticence at first but thought I'd try them anyway. The only time I've come close to the 1TB monthly usage quota is this month, entirely because (for work) I had to download a very large number of docker images, in addition to a normal usage of 500-750GB. I think it helps that some unused portion of the usage quota gets rolled over too. Out of curiosity, what are you doing that would make you regularly exceed 1TB?

I don't think I'm doing anything crazy, the odd game from steam, some ML models from huggingface, running a Plex server for myself and friends/family. I checked my usage and regularly exceed 1TB every month, so that's why I was put off.

I've been lucky that a new ISP came to my area and I can avoid Openreach infrastructure completely, they've put a FTTH line directly into my house and offer up to 8Gbps symmetrical