a) I got 135 out of it and it had some left to give.
1) I'm sorry, but you sound like a complete clot (and I'm using that word as an alternative to a less polite epithet with the same first and last letters). 135 on any road between Salisbury and Canterbury in conditions such as those we had today (patchy black ice, busy motorways) is so irresponsible as to be worthy of sectioning, let alone a mere driving ban.
2) Doing it in an MGF, which frankly isn't designed for those sort of speeds is equally dim-witted, especially as it's a car that you don't know, and in whose handling you don't have complete confidence, marks you out as a bull-shotter of the highest order, or a gibbering imbecile.
3) It's my business, because irresponsible, stupid twits (again, I'm using an alternative word, when I mean one with a different vowel) like you give soft top drivers generally a bad name, and, worse, kill innocent drivers who happen to be on the same piece of road on which you are practising your latest piece of lunacy.
b) In 4th gear, if I keep accelerating and 'screw the nuts' out of the (brand new) engine...it hits 7000 revs and then goes rrr rrr rrr rrr and judders about a bit.
1) You don't recognise a rev limiter, then?
2) You don't want your 'brand new engine' to last, nor even to perform well by running it in properly?
At this point I had already left the little **** in his Lotus Elan SE in my dust.
1) A disproportionate number of Elans today are driven by mid-ranking Police officers. I hope this was one of them and that your details are now highlighted on the PNC.
2) Since your hairdresser's yellow MG has significantly less power than an Elan, and is considerably heavier, the only reason that you can have left any Elan behind is that he was driving rather more sensibly than you were, and that he had more developed risk perception. I'm not going to be hypocritical and pretend that I potter around at 70 mph or less all the time, but there's a reason that the Police impose automatic bans for speeds significantly over 100 mph - even for cars whose handling allows it, and even if you are caught doing so in the middle lane of a dry, well-lit, empty motorway.
No offence meant to MGF drivers (you seem like a thoroughly good bunch, generally:URGOD

nor to hairdressers, but this chump's '****' jibe needed answering in kind, since his general demeanour suggests to me that he's probably rather insecure in his own masculinity and sexuality. (And the Elan's not a car for the small - let alone 'little poofs' - and as a result we don't have so many 'lovely ladies' driving the Elan as you have driving the MGF).