Well, my view of these things is that there is unlikely to be £110 worth of a problem with your pc seems that it has gotten through the first year or so. Generally speaking, any problems likely to arise may be software related. Clean out any dust from within the PC and ensure that all fans are running as they should and you should be ok.
The TFT monitor also should be ok - again, problems are likely to arise early. I don't imagine that the coverplan will cover things like wear and tear, and if the quality of the image decreases, it is likely to be put down to natural wear and tear. Same goes for the printer; unlikely to be a cause of concern.
But don't take my word for it; others will no doubt have their own opinions.