I would argue it does. After the first year it's the responsibility of the manufacturer to sort warranty issues, not the seller. In reality this happens from day one. There's no such thing as a warranty expiring after 12 months, the sale of goods act means it must last a reasonable time. .
Then you argue wrong.
For faulty goods, consumer protection under the Sale of Goods Act is with the seller, not the manufacturer. The guarantee is a separate contract between maker and consumer. Manufacturers need to abide by the length and terms they've offered therein.
Issues that may arise beyond the warranty that are covered by the Sale of Goods Act are again argued with the seller. Manufacturers have responsibilities for other product liabilities such as damage, injury etc.