So, miracles do happen. 7 business days after LATAM said they would refund me the ticket they finally did (11 months after I cancelled). I am sure the Money Claim action pushed them in to it and indeed that is still outstanding as, although LATAM have refunded me the ticket, my money claim included the £35 court fee and interest of £30 GBP.
I am not going to let them off the hook. They owe me another £65 GBP and once they pay up it will be over.
What a totally sh*t experience and shame on LATAM for forcing legal action to get them to refund a refundable ticket