Does Lufthansa offer a "free cancellation within 24 hours of booking" option? Looked at their website which doesn't show anything so I'm thinking not but wanted to double check in here. I'm in the UK and my flight originates from there if that makes a difference. I should also add that the outbound flights are operated by Brussels Airlines (inbound operated by LH and all booked on LH's site).

Edit: Just answering my own question as I decided to give them a call and they cancelled with a full refund minus the creditcard fee.