@gingernut Thanks; I did have a look on the NICE site, but couldn't see anything specific to the 24-hour monitor.
@CJS12 My thinking behind it was if it's being taken whilst you go about your day-to-day activities, it will inevitably be higher than someone who is sat in a chair doing nothing and so a higher limit being put in place. Ah well, I might just have to wait and see what happens...