OK
Have duplicated the problem.
The problem is that in the KIS antibanner settings there is a general block on *468x60* which falls foul of this instruction on the page
<td class="text-title"><img src="/images/referrals/adsl-broadband/super-fast/468x60_8mb-broadband.gif" width="468" height="60"></td>
Unchecking the above general block fixes it as per this picture
Perhaps PlusNet should look at the page coding
