People have said myrmica, aphenogaster and solenopsis

[zacadoda1]

Size: 5mm but 9 if antenna is included
When: 10pm 07/09/2023 (GMT time and date)
Where: Bristol (in my garden)
Appearance: Black on top and orange underneath
Behaviour: First runs around a lot then settles down
Picture(s): https://imgur.com/a/j3HV025

[AntsAreCool715]

Sorry but I don't know the species. Can you take some pictures that are brighter and more detailed? I'm sure other ant keepers on the forum can help you.