Stop the Drip: Simple Steps to Fix a Leaking Bthroom Sink Tap

Is your bathroom sink tap leaking behind the sink and onto the floor? Watch this video to see key areas could be leaking, how to diagnose the issue, and resolve it.
New tap I fitted is here: amzn.to/3Uv9czg
Flex pipe from bottom of tap:
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PTFE tape: amzn.to/3UrUSaU