From the website:
"See Tickets, Ticketmaster and Ticketline will be running a payment plan for customers who wish to split the full cost of buying their tickets into 2 or 4 monthly instalments.
Two-part scheme The initial payment is 50% of face value plus £8.00 booking fee per ticket.
Second payment of 50% of face value plus £5.25 postage fee per transaction (regardless of number of tickets in the booking) at a later date (yet tbc)
Four-part scheme Initial payment of 25% of the face value plus £8.00 booking fee per ticket.
Second monthly instalment at 25% of face value
Third instalment at 25% of face value
Final 25% payment of face value plus £5.25 postage fee per transaction (regardless of number of tickets in the booking).
Details If there is less than four months to go before an event the four-part scheme will be unavailable but the two-part would still be on offer.
If a payment is missed, or you decide you no longer want to attend the festival, a refund on the amount already paid is not possible.
Further details on each ticket instalment plan and the payment dates will be available once ticket prices are confirmed later this month."
:)
http://leedsfestival.com/news/article/ticket_instalment_plan Iirc, Ticketmaster has the face value as £192.50 this year, so you're looking at 4x~£50, or 2x~£100