Not to try to contradict Digital Dude - I'm sure his debacle was real - but my experience with Dell has been quite the opposite! Even tho' the service representatives are half a world away, I had next business day service on my laptop that occassionally needed something over its 3-year included warranty period (items replaced, etc.) and the local service guy was always in contact the next BD as promised, with the correct part to fix my problem, at my site! This excellent response caused me to buy additional computers from Dell, which so-far haven't needed any service. BTW - I'm using that same laptop (hard, I might add!) another 2.5 years past that original warranty period. Fortunately it hasn't needed any real service since the warranty expired (the top case is cracked at the hinges again, a design flaw that caused the cover to be replaced twice while under warranty, but that will now just get some superglue) 'cause I'd now have to pay for any parts and/or service. But I'm confident that they'd be readily available, with a technician to install them if I needed the service, as long as I am willing to pay.
Check into their TV warranty, ask how much the extended plan will add (might be worth it) and confirm who will do the service work if it's needed. It surely won't be across the pond, but probably some local independent contractor. The quality of service you experience will probably be more the result of what that local guy can/will do for you vs. Dell themselves...