Olive Tree… Fungus?

[smurfchops]

Further to my previous question 

https://www.theanswerbank.co.uk/Home-and-Garden/Question1892579.html

where can l ask online for advice about my olive tree?  My local garden centre told me to contact RHS but I don't really want to pay to become a member as I won't use the membership for anything else.  Can any websites give advice?  Thanks all.  

[Buenchico]

It might well be one of the many types of bracket fungus.  If so, there's not much that you can do about it:
https://www.rhs.org.uk/biodiversity/bracket-fungi

[smurfchops]

Thanks Chris, I will contact  both of them for advice.