Apologies for not responding. Been quite unwell.
I've had the test results back, but they're negative. After spending yesterday waiting 5 hours to see a doctor, they've diagnosed me with a really nasty bout of bronchitis again, and it has well and truly knocked me for six.
The good news is that it's a LRI, so if I can survive this - I should be able to survive an URI.
Good to hear mate, you take care