That combination isn't supposed to work Maybe they badged
some SHQ's as MC's

If it's not prompting for the FL you might find the answer in
this thread link unfortunately it's been bloated out to 39 pages
long by people who don't know what they are talking
about and don't even own a TC, but like to think
that they can just imagine an answer

Sounds like the type of thing an ebay seller would say

The TC seems to be working perfectly even though it didn't
say SHQ on the TC or the box? (Pz-AF 1.5x Teleplus MC)

Are you setting the FL manually?.... from the exif it's
showing 300mm you need to set 450mm?

You can't tell too much from one shot especially when you don't know where they are focussed. That's why I prefer lenses that work at infinity.... usually everything from about 5m to infinity is then in focus.

It might be the lighting, but the one on the left looks sharper, but considering it's a prime against a zoom I would be surprised if it was.

Mine seems quite sharp right across the frame, but the lights been bad.
It does look good though in the shadow areas which means it has good contrast.

Great ads.... that little girl must be only 8 inches tall

I can't remember my FA 50mm f/1.4 (which I sold 18 months ago)
doing that and all my pentax MF primes don't go beyond infinity.
I normally just set anything from 24mm to 35mm to infinity and
leave it there.

The only MF prime I have that goes beyond INF is the Sigma II
24mm.

I suppose if other people have 35mm f/2.4's that go beyond
infinity I'll just have to live with it.

The boxes look brand new and unopened, so I'm quite sure they aren't returns.

The colour rendering using AWB especially considering the time of year is spot on with Jpegs

Mine seems OK on AF, but on manual focus it's going
just beyond infinity which I'm not happy about.

How are other people finding their's focuses on infinity?
Spot on or just a bit off?

Edit: The image in the viewfinder is good enough to
focus on.

As long as it doesn't say "made in china from scrap slot machine parts" it should be alight

Panasonic did a similar thing about 5 years ago. They discontinued all their TV DVD/HDD recorders without any replacements being available and once they dried up in the shops you couldn't buy a Panasonic recorder anywhere. I managed to find one in Argos and then about two months later new models started to appear. Even Richer hadn't got any.