Beagle,
Probably about as easy to maintain as a 4-engined Lightning?
Ouch. Mind you at least the B-58 engines dangle from the mainplane. I was thinking more about the aluminium/ fibreglass honeycomb panels amongst other things.
Definitely special going those speeds, even if it could only do mach 2 for 30 minutes. The engines could do the speed, and more; the paintwork couldn't take it.