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Also, unfortunately, I just can't justify the time for pootling around on an Audax, as most seem to be a long way away.
Your'e in Luton, you say? I admit I'm amazed that anyone has more sportives near them than Audaxes.
I did say I'd only done a couple!
The problem is, when looking through the audax rides listed on here, a lot do seem to be a long, long way away. The snag is, even for nearer ones, like the many that go around (and up!) the Cotwolds which I'd like to go on, I just feel guilty using the car to get there, ride the bike for a good few hours, and then drive back again.