Tiling other after old tiles removed

[XanderHarris]

Would it be ok to tile over this surface? After all the old are removed?

 

[freddiemercurystwin]

It looks fairly sound, is any of it loose?

 

[XanderHarris]

I'm going to have a look it's a picture my friend sent me I'm a plumber by trade

 

[XanderHarris]

Closer in picture

 

[XanderHarris]

Would you think scrap any loose off if any of the top layer is. Then prime with SBR bond before tiling and should be ok?

 

[XanderHarris]

It should be ok or calls for skimming

 

[XanderHarris]

Is it kind of a hard one to tell without seeing it? Thanks for any advice