Also don't forget it's the Budget next week. Hot on the heels of the Chancellor's pension climb down, there are talks of the annual allowance bring cut further from £40,000 to £25,000, or even as low as £10,000 to make up for retaining tax relief.
If that happened, I can see senior flt lts and possibly some of the more senior NCOs & WOs incurring a tax charge. Best you don't spend any of your increase just yet ... just in case