Jake wrote:
Sommat that small - grass thrips maybe? Apparently they do bite,
usually on the feet or ankles and the result can be much bigger than
them! Immature ones sort of have stripes that go round them (rather
than from front to back).

Hmm, images don't quite look the right colour, but it /could/ have been one
of them, I suppose.

I tried entering your description on a helpful little insect
identification web site that Oxford University maintains. It helpfully
suggested that you probably have a bug of some sort ;-))

:-)

If the bite drew blood keep an eye on it for a few days and if it
swells up get thee to a medic to get it checked. Better safe than
sorry.

Pfft, I've had a chesty cough and bad breathing for over 2 weeks now and not
managed to get to a doctor, unlikely to make it for a nip from an insect.
I've always blamed red ants for the hugely swollen insect bites I've had in
the past (my whole hand puffed up to twice its size last time, and I've had
the same on an ankle, plus I have what I presume was once a bite on my
thigh (missus!) which is at least 3 years old and has left a permanent lump)