Calipers arrived. Each caliper supplied in plain black box with just stickers attached to one side of the box as visible in attached photos. A generic A4 instruction sheet is included.
I've fitted the new Right Front caliper to fix original seized caliper issue. Relatively easy job.
During fitting, I didn't want to clamp the flexible brake hose to stop fluid loss for fear of damaging the hose due to its age (Also, I didn't have a hose clamp....). So I topped up the reservoir and refitted the lid with a piece of thick carrier bag plastic. No idea if this actually works to hold a vacuum. When I did finally separate the banjo connection, I quickly wrapped a plastic food bag around it and tied it off. The bag collected about 5cc by the time I attached the hose to new caliper. Bled the caliper afterwards.
Here are photos of spare Bremtech Left Front caliper and original steel? aluminium and new copper banjo washers.
Update 20 Feb 2020: 3 weeks has elapsed. Replaced the other remaining 'working' 13 years old fitted front caliper.
Afterwards, I tried to push the piston of this removed caliper back into the bore but it wouldn't move. Must be severe corrosion in the bore, and it would likely to have eventually seized up.
The original front pads were also wearing thin. Last summer when I stripped, cleaned and refitted the 13 year old pads, the pads on the piston side were down to around 3mm, but the ones on the outward side were nearer 5mm. In hindsight, I should have realised there was an issue with both front calipers, which led to one of them eventually seizing.