Sorry to take so long replying Annie and Trace(had the grandchildren out for the day).
I have just been back into the thomson website and it's not showing the 4th June from Glasgow now. As you have said they are now showing as starting from 13th. It was definitely there when I looked this morning.
Because of what you had said in your thread I searched the package holidays from Manchester for the begining of May (when I usually go) these showed up as starting on the 2nd of May.
Out of interest and the fact they are flying from Manchester at the begining of May, I then looked at Glasgow and starting the search from May to find the first available flight. Unless I am loosing the plot (which is a possibility) I'm sure it showed the 4th.
Hope this makes sense when you read it.