That looks like the bites we used to get in our garden – we assumed expatriated Blandford Fly, though I can't say we ever saw one of the little fuckers in the flesh, they'd bite chunk out and you'd only notice it later, around the phase of furious itching, then it would swell, bleb, and finally crust over a way that would make people vacate nearby seats. They came out at twilight and went primarily for lower limbs. Completely undeterred by the levels of DEET that make sub-Saharan insecta say 'whoa!'
The only way to avoid them was to either cover up or avoid crepuscular ventures. We eventually moved house and they don't seem to have followed us.
