Re: ..
(a) avoid the big multinationals — Currys, etc. — not because they're "evil corporations" or "furriners" but because their managers are usually less than 6 months in the job and will have moved on by the time you have a faulty item/after-sales problem. So you'll get the kind of treatment (vaguely) evoked above...
(b) seek out instead a small-to-medium outlet that's been around your area since you were knee-high to a grasshopper — they're less likely to risk spoiling their passing trade by messing you around, and in my experience they will always try to match the "special offer" ad from category (a) above — or come out and tell you frankly if they can't, which is nearly as good...
(c) Once you've shopped around, get your chosen supplier to knock off
at least 10% on the total price of a "package" including all the items you mentioned. DID and PowerCity (to mention but two) will definitely do this. They know it makes sense...
And finally,
(d) The previous posts are both right — paradoxically. You pay over the odds for established brand names, but there are also significant differences reliability-wise. Quiz the salesperson. Ask them which brand (of the particular item in question) they have least "comeback" problems with. It's in their interest as much as yours. And yes,
don't buy the extended guarantees. They're money for old rope, from the suppliers' (and the insurers') point of view... If your appliance doesn't develop a fault in the first 12 months, it's unlikely to do so in the following 48. And if it does, the price of having it repaired/replaced is likely to be less than what you would have paid out in premiums for the extended warranty.
Dr. M.
[P.S. Congrats on your new home. "Well wear"...!]