flybe "taxes and charges" on GCI-LGW-GCI are £40.10 Vs Aurigny at £23.50. The difference is because flybe include fuel and insurance surcharges to the tune of £8.30 per sector, whilst Aurigny absorbed these into their fares some time ago.
THe only reason I can think why flybe continue with these as "taxes and charges" is to give a lower appearance to their fares when prospective customers search through availabilities.
That said they do show the inclusive prices on the right hand side of the screen.