Martin Baker still use a pair of Meteors for ejector seat trials at their base of Chalgrove.
Modified T.7s (with F.8 tails), often referred to as "T.7½":
But both newer than the Sabre (1949 & 1952), though WA638 can lay claim to be the oldest jet still flying on behalf of the military (leased by the MoD to M-B).