Ok this is indeed a Facebook issue. Just done some digging and it seems that permissioins were changed a few weeks ago.
As this is a very useful advertising tool and bridge for community building I wanted this working again ASAP.
So here's the answer. In Facebook go to your profile (click on your name top breadcrumb center) and then click the downward facing arrow at the end of the breadcrumb menu bar.
Scroll down to settings and click that.
Now on the far left click Privacy
Now from the Privacy setting and tools choose the second down, "Use Activity Log"
Once that is open click on the cog symbol between Notifications and the spy glass.
Now a Timeline review box will open... choose Enabled from the drop down box and choose close.
That's it. All likes will now show on your timeline as before.