@Orangeblossom7777 yes through work - NHS.
I've just had a look online and the articles that I can find suggest there is a high percentage of false positives and false negatives with these.
False negative - I'm in the same position as if I hadn't taken a test, I'll still be distancing / mask wearing etc, and will book in a PCR test and isolate as per the usual process.
False positive - this is slightly more annoying as then the DCs would miss school isolating with until I'd taken and had the results of the PCR test.
Its not mandatory for us to take these at work, but if we opt it it becomes mandatory to continue twice weekly. DH and I have agreed it's for the greater good so I'll start next week.