A customer of mine purchased 3 pairs of taps from them, I installed the taps and they were fine for a year.
He called me back to his property because a couple of the taps were dripping, I tried to get some ceramic disc valves ( used instead of washers ) for the taps but none would fit.
I asked the customer to ring Victoria Plum to order some spares, they told him the guarantee had just expired on the taps and they do not sell ceramic disc valves as spares.
The taps should have lasted longer than 1 year and 1 week, even the cheap taps from Screwfix have a 2 year guarantee.
The guarantee shouldn't make too much difference. Taps should last considerably longer than a year and if you can show that that they have failed through no fault of the customer or installation then you should make a claim under the Consumer Rights Act 2015 (replaced the sale of goods act). I made a claim outside of warranty for a faulty television a few years ago but that was under the Sale of Goods Act. I got the tv repaired free of charge. If the goods were purchased using a credit card and are worth more than £100 then you can claim against the credit card company as well.
http://www.theguardian.com/money/2008/jun/17/consumeraffairs1