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There are two potential issues, either the feed is faulty or the tuner is faulty.
To rule out the feed I would suggest you unscrew one of the coax leads going to the sky plus box and plug it into the DVD recorder then retune.
If the issue persists it rules out a faulty cable, LNB and it must be a failure on the DVD player.
The next step would be to do a factory reset on the DVD recorder, the manual for the unit can be found here, instructions for performing a factory reset are on page 110.
If the factory reset didnt work, then this would suggest its a hardware failure, most likely the Satellite Tuner, which would be uneconomical to repair.
Please let me know if you require any further assistance.
Thanks for letting me know it sounds like its not a faulty cable and must be with the DVD recorder.
Let me know how the factory reset goes when you get back, safe travels.
This must be a fault with the inbuilt tuner then, since we have ruled out a cable fault (so know signal is getting to the box).
Due to the age the unit I think its uneconomical to repair, as the Tuner normally is integrated on the main board so you end up changing 60% of the unit.
If you would still like to proceed and look to get it repaired, if you provide me your post code I can recommend a suitable service centre who can look at it for you.
I have referred customers to East Midlands Electrical (01476 576160) in the past, they are 10 Miles from you in Alma Park Rd, and have always had good feedback.
In speaking to them they have advised they may struggle to get parts, as Panasonic (like most manufactures) would sooner you buy a newer model every few years, but advised they will perform a diagnostic and give you a quote for repair for £20, which is nonrefundable if you proceed with the repair\the parts are available.