Hi Susan,
collecting Virgin air miles can provide some good deals with the "miles + money "scheme. 2000 points plus £180-00 out of season; THIS september would be 2000 points plus £350-00. I collect with their credit card. 1 point per pound ( or 2 points if pay £80-00 annual charge.)Normally an introduction offer of 3000 to 4000 points when card first used. Premium economy can be £5000 + 7500points out of season.
PM me if you want more details.
andrew