Over the last few years our QP tickets to the UK have been extremely generous. Almost double the cost of the Qatar Airways flight. Don't forget they pay for you to go to your NEAREST airport, if your nearest airport is, for example Bournemouth or Exeter types, the allowance includes the value of either a connecting flight or taxi from the major airport. They pay your flight allowance along with an advance on your wages about 3 weeks before you are due to travel. You need to check with your line manager how far in advance you need to  book the leave and request the money.  It's been very generous to us, in fact, as an employer I can only say positive things about them.  They are also extremely fast to organise everything if you need compassionate leave in a hurry. Your exit permit is usually processed same day.