Ryanair will force parents travelling with children to reserve seats on flights at the cost of £8. 

Under the low-cost carrier's existing rules all passengers can currently choose to save money by having their seats randomly allocated.

But the Dublin-based airline said this has led to 'boarding issues' as crews try to re-seat adults and children who have been separated.

From September 1 adults travelling with children under 12 years old will have to purchase a reserved seat. 

A standard reserved seat costs £8 per flight, according to Ryanair's website.