I am constantly surprised by people who say they are trying to buy British made products.
As a country new chose in the 1980s and 1990s to stop making things and outsource, or offshore manufacturing to the 'Tiger Economies' of the Far East. Because we wanted tax cuts and cheap products.
The UK's GDP is now made up of service sector and tertiary businesses by more than 75%.
We think perhaps that James Dyson is producing a 'British' product, or indeed 'Apple' - all of these are made in either China or another of the Far East manufacturing countries.
Rather like the OP, I too struggle to find say an item of clothing, household appliance, computer, tablet, phone, TV, or a car part that is made in Britain.
Even the steel for our "independent nuclear deterrent" is manufactured abroad. The on-board electronic systems were made by a French-German consortium, and now by a US company, which no doubt farms out the component manufacturing to China.
Still, I believe a JCB is still mainly assembled in the UK.