Unclued you are a diamond :-) Thank you. This was one of the two variations I’d tried but your guidance encouraged me to return to the cross, locate and circle the TERMINUS pairs, and then reassemble. How I did not see the beginning of the 10 letter word the first time I’m not quite sure: I played a certain drop and stack game rather too much in my youth! (*You played it even more mum... wink, wink, nudge, nudge*). This was an incredibly clever puzzle - hats off to Shark.
Now to assemble the final neat version (must write a little smaller and more centrally methinks) and post it along with last week’s which is still hanging around. I’m determined to tick this off your bucket list (by proxy) mum, get my name in the small print and demote my 2003 BRB to doorstop status :-)