MG
In "ITV" hands probably the answer is yes. Whether the BBC Elstree, formerly ATV Elstree, studios are older is a trickier question. ATV didn't buy them until 1962 (so they weren't "ITV" before Havelock) but they were built much earlier, and used for TV productions (though I guess on film?) before ATV occupied them apparently.
Just on this point, ATV bought them in 1959 and opened them in 1961 having built a huge extension onto the original 1920s/30s Neptune Film Studios.
Granada Studios sold to Ikea
So will UTV's Havelock House be the oldest still in use studios once Granada finally closes? Havelock House have operated since 1959.
In "ITV" hands probably the answer is yes. Whether the BBC Elstree, formerly ATV Elstree, studios are older is a trickier question. ATV didn't buy them until 1962 (so they weren't "ITV" before Havelock) but they were built much earlier, and used for TV productions (though I guess on film?) before ATV occupied them apparently.
Just on this point, ATV bought them in 1959 and opened them in 1961 having built a huge extension onto the original 1920s/30s Neptune Film Studios.