Originally Posted by
Andriyko
My experience was with BA but hopefully it is a helpful data point. I was refused at EWR to have one bag short-checked to LHR (on an overnight connection) and the other continuing to KBP. While the agent confirmed that short-checking was possible, they stated that all bags must travel to the same destination so either both bags travel to LHR only and I recheck the next day or they travel to the final destination.
Interesting. In the OP's situation this might work quite well with the length of connection. Collect all the luggage at LHR and check one back in for the flight to ABV. This last part is no problem at LHR on BA.