All it took was a night's rest and here it is looking more like the standard!
I've even got another spike snaking its way through the tank. I'm very lucky.
Note for other photographers: Y'all probably already knew this, but versions of vBulletin before 5.x.x, what powers our forum is version 3.8.8, automatically rotates our photos a quarter turn anticlockwise when it notes a change in the orientation which it gets from the digital images EXIF data. So, you can either stop holding your camera sideways or edit the metadata before submitting.
The 8 EXIF orientation values are numbered 1 to 8. There isn't just portrait or landscape.
1- 0 degrees: the correct orientation, no adjustment is required.
2- 0 degrees, mirrored: image has been flipped back-to-front.
3- 180 degrees: image is upside down.
4- 180 degrees, mirrored: image has been flipped back-to-front and is upside down.
5- 90 degrees: image has been flipped back-to-front and is on its side.
6- 90 degrees, mirrored: image is on its side.
7- 270 degrees: image has been flipped back-to-front and is on its far side.
8- 270 degrees, mirrored: image is on its far side.
...Naturally, you'll need additional software to do it, appropriate to your preferred OS.