Yup, they told me to shove it.
"Thank you for contacting Expedia.co.uk regarding the refund for the flight reservation.
I would request you to please contact the credit card provider or the travel insurance provider in order to recover the full refund paid for the original Malev flight.
However, you can book for other flights as alternative by calling us. We are available 24 hours on 0330 123 1235 or from outside the UK on +44 2030248211 (usual costs apply).
Your patience and understanding is much appreciated in this matter.
Thank your for using Expedia.co.uk."
I knew that would happen. Oh well, I'm going to send off the chargeback request first thing tomorrow. Hopefully Lloyds will be nice about it... I like how they told me to contact my travel insurance provider. They don't usually cover this sort of thing, anyway, do they? Not that it matters. I hadn't bought a policy yet as I only booked the flights yesterday.