An egregious abomination:
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= new reply since forum marked as read
From one of the forums' posts, https://forum.etypeuk.com/viewtopic.php?t=254
Several of the posts say that the UK regulating agency (DVLA) has said that the bonnet location for the E-types an acceptable exception to their general (vertically mounted?) registration number display requirements.
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BTW, a bit of backstory of that particular vehicle:
https://www.carandclassic.com/us/car/C1094177
2,688 Miles
1962
[...]
Finished in Opalescent Blue metallic complimented with full black leather interior.
The vehicle registration document shows his and hers ownership, a local owner who had great connections within motor sport especially classic and historic the Jaguar was driven across to Europe often, the last major trip to celebrate Switzerland 1986 International Commemorative E-Type Rally, Brighton, Geneva, Crans to Interlaken, Brunnen.
A very reluctant sale originally her late husbands motor car, accepting maturity sadly she is unable to drive the Jaguar E-Type anymore.
Our Fisher Restoration Company were recently commissioned to complete a full bare metal respray no expense spared and certainly not rushed this has been completed to a very high standard we do have a photographic record of the work showing the excellent condition of the bodywork.
[...]
...but not that early, because the original model didn't have external
glass covers over the headlights...Saw the original in London when
it came out...The dumb blonde of sports cars. Enzo (Ferrari) said
it was the most beautiful car in the world.
...In '51 The 120C-type won Jaguar's 1st Le Mans victory.
Even more beautiful than its predecessor, the D-Type used a
space frame and magnesium alloy for the body shell. Lighter
and more rigid as well, the monocoque racing car won Le Mans
three times on the trot, with many other overall wins at circuits
that include Goodwood, Reims, Spa, and Sebring.
My family owned Jaguars:
All bulletproof inline 6s identical to the Le Mans winners...
'57 Mark VII,
'62 Mark 10
finally a '66 420G
Whee! Thanks for the trip down memory lane 
well I had little accident with the 420, just dinged the R headlight surround
(unprotected by minimal bumpers mind you)!
Realized I wouldn't get to drive it again...there was a brand NEW INTERSTATE
with 0 traffic....so I took it up to 90..; after a while it got boring, so I brought it
up to 100, pulled over to the left to pass a late model T-bird. He wanted to race.
Fine. I hate people who speed up when you pass them.
So 110. Took a little while (5-10-secs) for him to match that.
120 This time it took alot longer to match 120. 
I floored the accelerator pinned the speedo at 140.
Held it there for about two minutes, really understood, (landscape
flying by! The road narrows at that speed!) that I was in a car bred
to race, slowed back down to 100...no sign of the T-bird.
It was 15 yrs before I drove the car again. It needed a steering rack
moron father sold the 420G for $600. (I would have paid 3x that,
and fixed the rack myself)
Told him so! Idiot.