Extras £151
Total £490

That's nearly 50%. Over £60 of this is a "fuel supplement". How can there be a fuel supplement in January for flights in August?
The moral is ignore the front page price on all internet bookings, because these extras don't come up until it's time to cough up!
(P.S. These flights are with Monarch, other companies were even more expensive. Easyjet flights are almost double what they were this time last year!)