Back-to-Back flights [not back-to-back tkting]...
I know this... TLV is home... IB is relatively painless (only insofar as it is short)... But LHR-TLV-LHR-MAD is £358, and LHR-TLV-MAD (although timing is better) is a whopping £900+/- (I guess it books into Y)...