It's only worth it for larger families, e.g. in a family of 5 if one of the kids was doing facetime for 2 hours you'd really feel that slowdown as it maxed out your 1mbps upload.
Hence 10Mbps and 20Mbps upload can alleviate a lot of that. TalkTalk is only 2Mbps upload which is quite useless in my view.
Otherwise, things like 4K Netflix need around 15Mbps so if you had a 4K TV you might find the upgrade worthwhile to get that experience.
My old house I lived with a girl in media and she was uploading 10Gb videos, hence we needed the fastest fibre to keep the downstream usable.