Ants on the table is a common problem through out the Kingdom and conveniently enough a unique solution has long been provided and is available in most "utilities" shops ie. plastics/tools/etc everywhere. Your solution is inexpensive and easily obtained. I hope this helps.
I just rec'd the same notice except I am not a PR holder. I just happen to be waiting to receive my updated marriage visa and (as always) my current stamp is past (Aug 9), with the new one Sept 7. Once again totally wasted time.