The last set of figures quoted are from the pay restructuring before the recent 2.5% (from memory) RPI increase.
Furthermore, the flying hour pay is being held at £10 per hour for captains and increased in 2? stages to £9 then £10 for copilots, all taxable..
The £2.50 per hour is now £2.58 in line with inflation, of which 18% is liable for tax at your marginal rate.