Lonsdale Number is 01332 378440. You have to be a travel club member and the price does not include the ticket, which should be around £30.
I used Lonsdales to fly to Barca, and booked before I joined the travel club. LFC then issued a card on the basis of the booking, even though the list was "closed".
They may not be so keen this time around but it may be worth a try if you are not a member...
Michael