If you want a Fluke 2pole tester, don't pay those Screwfix prices, you can get the T110 for about £27 cheaper from reputable online dealer, less probably £6 for carriage.
I know Screwfix seem expensive. These have them: Fluke T110 Voltage/Continuity Tester - https://www.test-meter.co.uk/fluke-t110-voltage-continuity-tester/