I have 4 US Tennis 15% off Certificates but my trip to LHR won't be until 7/2004. They expire a few months before that. anyone have any ideas on what I should be on the look out for and when so I can get a discount.

It is sort of a cache 22. If I wait until new discount certs are issued, then maybe the upgradeable H fares are gone yet the Certs I have now won't work.

Tell me where I can buy this entertainment book and when the new Certs will be available.