Are the rear brake mounts on my Boardman Team HT post-mount or IS? Boardman Team HT

Last weekend I broke the rear brake lever in a crash. I'm looking for a replacement brake disc kit for the rear brake, but I don't know what kind of mounting I've got. There seem to be two types, post-mount and IS (International Standard).

The shop I bought my bike from didn't have a manual when I bought it, I can't find one on-line, and the boardman website doesn't seem to have it or any contact info.

Which system does it have?

I'm pretty sure it's post-mount on the front as I've found a manual for the front fork.
You should be able to look at the bike and take a look:



It should be pretty straightforward to identify how the brake caliper is bolted to the frame.