I received the cancellation email last night and a refund notification this morning.

I requested an invoice for the trip from the Opodo website and worryingly, it only shows I paid just around 37GBP. which allowing for currency fluctuation is around what I am initially being refunded. My credit card invoice shows the bulk of the cash was charged by Opodo Leicester

Hopefully the bulk of the fare is being processed elsewhere and I will wait before escalating.