Manufacture of any electronic device is difficult to really designate a specific locale, but as far as the RPi foundation is concerned, some of the RPi’s are‘manufactured’ in the UK. You can recognize them by checking the print next to the power jack – if it says “Made in the UK”, it should be assembled at the Pencoed, Wales plant.
The product images show such a board, but I’d imagine the actual board received may depend on the boards SFE receives when putting in the order. Mike’s mention above – “Reality may vary” – applies here as well :)