A colleague traveling on two separate tickets to HEL-LHR on BA and then switched to VS to get to the US. Despite (presumably) being warned that his bag would not be checked through, he transferred airside and departed the UK.

Now, it’s clearly his fault and responsibility to repatriate the suitcase, but how does one do that? Will BA keep the bag in lost property? Can you get FedEx or UPS to pick it up? Does BA offer a paid shipping service to put a bag on a later flight?