Trouble with tap

[wanttolearn]

Hi guys having a bit of a issue with a brand new tap on a wash hand basin. I've fitted the tap but it keeps dripping by the back nut underneath the tap. Thought it may of been the rubber washers but changed them.
Could it be a dodgy tap?
Or am I missing something

 

[wanttolearn]

No customer had them off Internet. Not sure which company though

 

[PlumbBobBob]

most likely Chinese imports from ebay then and not wras approved

 

[Billy Bob Bob]

Thanks for the quick response but it's leaking even when the tap is not running in wash hand basin

missed this bit sorry,have had cheap taps not cut square at the base

 

[wanttolearn]

I took the back nut off tap and connected flexi and noticed that it was leaking from the brass thread that goes into the bottom of tap

 

[ShaunCorbs]

I took the back nut off tap and connected flexi and noticed that it was leaking from the brass thread that goes into the bottom of tap

Should be all one piece and cheap taps