If you bought a plasma from Empire Direct the warranty is with Empire Direct rather than Panasonic.
To get the 5 year Panasonic warranty you have to buy the plasma from a store, which us why I paid £150 more to get my 46PZ85 from a local HiFi/TV specialist shop rather than Empire Direct. You get paperwork from your local shop when you get your set, which you return to Panasonic and you eventually get a warranty certificate with expiry in 2013 for mine....
I got a quote for 5 year extended warranty from Domestic and General for the set, for if I were to buy it from Empire Direct and it was £400, which made it a no brainer to buy from the local shop. Also one look at the terms and conditions of Empire Direct's extended warranty put me off, having to pay £30 to join an extended warranty club + more to get years 4&5 ????
Unfortunately your extended warranty is with Empire Direct so you will have to approach the administrators, to get money back, if you paid for the warranty, or else could I suggest a visit to
www.domgen.com, not cheap but could work out cheaper than a repair in a couple of years times.
One word of warning about D&G extended warranty's they are not new for old, if they can't repair (which is quite common for older plasma's) they give you a % of full value ie for years 4&5 of 5 year warranty it is only 30%

and if they replace the set thats the end of the warranty (at least it was with my dishwasher

a year or two after it was replaced, I ended up arguing it out with the manufacturer who refunded my money eventually).