Bristan tap leaking - can't get to washer

[Michael G]

I have a leaking Bristan bathroom tap. I am guessing that it's the washer that requires replacement although I am knew to such plumbing jobs. I have managed to remove the tap from the washbasin but I do not know how to remove the top off it to get to the washer. I have tried with a flat screwdriver but it won't budge and just scratches the tap - see attached photo. Can anyone please advise me on how best to do this? I have attached below some photos of the tap.

 

[John the plumber]

Where’s the photos?

 

[denso13]

No photos...

 

[Michael G]

Very bizarre, they were uploaded early but I can't see them now either. I have uploaded these again. Hope you can see these now.

 

[Elkato531]

Not sure why you removed the tap from the basin. The domed top may unscrew. Difficult to grip but try wearing rubber gloves to give a bit more purchase. Or the whole top may just pull off.

 

[RayCaister]

Here is my best guess. This is not a current style from Bristan but spares should be available. It may be a cartridge type tap that does not use a washer but a ceramic cartridge. The domed top will give access to the workings, and should prise out useing a fine but strong blade on a penknife. Then you will see a screwhead that holds on the shroud and below that the cartridge.