What can I use to increase the height of my fence?
"Lattice Fence Topper" + Clematis.

This is also a deterrent against intrusion - see example police advice


  Diamond design trellis as a topping to your fence, makes it much harder to gain a hand or foothold.  It is also difficult to climb over (especially if entwined with prickly or thorny climbing shrubs).


Maximum fence height depends on your local authority. In the UK, nothing more than 2m is generally allowed.