Toilet constantly trickling

[Micramary]

Hi
I noticed our toilet was constantly trickling. I flush it and it stops then starts back. I have changed the diaphragm washer but it didn't stop it. I have attached a picture of inside the cistern, where you can see some water coming out of a small tube - I've pointed to this with black arrow. Any ideas? Do we need a new inlet valve? Thanks

 

[denso13]

Does it keep filling then overflowing down here?

 

[Micramary]

Yes - the water from the little pipe seems to raise the level which goes into the overflow and I assume then the trickling begins.

 

[denso13]

If you are sure the washer is fitted correctly then, yes, fit a new fill valve.

 

[Micramary]

We're pretty sure we've fitted it right - did it about 6 years ago, although that time it was hissing, whereas there is no noise this time. Thanks for your advice.

 

[polesapart]

May only require https://www.screwfix.com/p/arctic-hayes-siamp-diaphragm-washer-29mm/5006j

Accessed by undoing the large knurled nut on the fill valve. water off, obvs.

 

[denso13]

May only require https://www.screwfix.com/p/arctic-hayes-siamp-diaphragm-washer-29mm/5006j

Accessed by undoing the large knurled nut on the fill valve. water off, obvs.

I have changed the diaphragm washer but it didn't stop it.