Booking an itinerary with 3 transits through LHR: CPT-LHR-MCT-LHR-IST-LHR-DFW, 2 of the transits are overnight but all 3 are less than 24hrs. The booking tool lists the following UK taxes: UK Air Passenger Duty 181.40 AUD
UK Passenger Service Charge 121.50 AUD .
Is that correct for transits under 24hrs?