Approaching Panasonic direct will not produce the results you want, they, like some other big corporations do not operate that way, this is a quote from their warranty info.
For appliances used in the U.K., Channel Islands, Isle of Man and Republic of Ireland and Iceland,
the appliance should be returned together with this guarantee and proof of purchase promptly on
being found defective, at the purchasers risk and expense, to the authorized dealer from whom the
appliance was purchased
or to the nearest authorized service dealer. All enquiries must be through
such dealers
Have had a look at your local dealers that may be able to help, here is a link to them, dealers 1 and 2 seem to be your nearest, give them a try.
http://www.panasonic.co.uk/html/en_GB/Dealers/Independent+Dealers/1164787/index.html#anker_1164790
Just take proof of purchase, MODEL and SERIAL number of your tv ( can be found on small label on back of tv towards the bottom). A local dealer can achieve much more through the network than you can by going direct to the top, I know I have worked for a Panasonic ASD for over 30 years.
John