According to BHX website, tripods / monopods are not on the list of banned items, but the list doesn't cover all items. Presumably by now, if they wanted to ban it, they would have done? Am also taking checked luggage, so I still plan to take it with me one way or t'other:
Banned:
Toy or replica guns
Catapults
Household cutlery
Knives with blades of any length
Paper knives
Razor blades
Tradesman’s tools
Darts
Scissors with pointed tips and blades longer than 3cm
Sporting bats
Billiard, snooker or pool cues
Flammable liquids
Gas canisters, Butane energy cells
Noted - trademan's tools, but photography is surely a hobby or a profession (and the pedant in me would like to point out not all photographers are men either!).