For closure on this one, got there in the end. Just a hair over £1100 with Bikesure with a tracker fitted, or £15xx for both bikes.
Turns out the silly quotes were down to the fact it wasn't "garaged" - I live in a little apartment in the bay looking over one of the old dry docks, with parking beneath the complex - to get to where the bikes would be kept a proverbial ne'er-do-well would have to get past a 24/7 concierge, the gate itself, then past 3-5 cameras in the resident's parking, and then a second metal gate with a combination lock to the bike/motorbike store, but as it's a resident's car park it's treated as "on the road". At the end of the day it was cheaper to rent a garage for the year offsite, but still baffles me that it was fine for the 1200r when they quoted.
First proper ride today so it was all worth it in the end!