Consolidating 2 x 150/35 -> 1 x 250/85 (different arrays, different sizes)

I don’t have it anymore. It was issued about a year ago.

I thought they’d quote me for new panels that would use the existing mountings, wiring etc.

I can’t swear to the mountings, but certainly they were going to recable, fit new lightning arrestors, new fuses, new DC breakers… The new cabling meant new conduit etc.

Have you considered a DIY? A mate of mine was not happy with the options on hand, so he got his appy and did the whole install himself. I thought he was mad, but over a few days he did a perfect install that was CoC’ed by an external electrician and then registed with CoCT.