Hi Renee, very kind of you to take a look!
What I did in the end as a placeholder was a straight forward \D in regex, and then another formula to remove the last two digits (cents/pence) as I couldn't find a way to take into account the period. That got 99% of the cost in
I'll spend some time soon looking at a way to fix it precisely, but on the upside have upskilled in the regex department! Kev