Foolishly I didn't allow for the sub zero temperatures when calculating liquor temps and by the time I'd drained the HLT into the mash tun it had lost almost 5ºc so some frantic kettle boiling was needed to get it close to strike temp! I ended up missing mash temp by 1ºc but I put that down to the grain cooling down while I was farting about with the kettle! despite this my mash efficiency was at 83%
The rest of the brew went swimmingly and I ended up 1 point off my target SG. Looking forward to supping this one!
Obligatory grain shot:

Pellet power

First runnings

Think Ive found the limits of my mash tun!

SG:

Aeration anyone?
