Well my Manchester tickets just delivered by the Royal Mail-signed for/recorded delivery. Feels very old school getting paper tickets posted! Better not forget them as travelling down from Scotland by train so can’t turn the car back if I do!
Also seems that TIXR have an office/ location in London as the address on the back of the envelope was TIXR, Uncommon Borough, 1 Long Lane, London SE1 4PG. Thought looks like a flexible office space.