What a day! Multiple trips to get tools, new plastic CV boot cable tie turned out to not work so well due to chunky clasp fouling the inside of the hub, so stainless cable ties bought as replacements but never easy to fit without a proper tool (which of course, we don't have).
After some blood sweat and tears, everything connected back up again and secure
Drum put back on, wheel back on and. A quick test around the block shows no issues. Just the number plate left to drill and fit tomorrow and we're good to go for the MOT retest!