Glad to help in some small way.

I hope you manage to get it done.
A shame my dad's not online, he's a professional, gold winning Chelsea gardener and I'm sure he'd be more useful than me! By the way, we put sticky Grease bands around the trunk.
Louise
Grease bands
Mottled umber moth (Erannis defoliaria), winter moth (Operophtera brumata) and March moth (Alsophila aescularia) have wingless females which, after emerging from the pupal or chrysalis stage in the soil, must climb the tree to mate and lay their eggs. The caterpillars of these moths eat the leaves of many deciduous trees and shrubs during late March and early June. Grease bands trap some of the wingless females before they reach the branches. Winter moth (see photograph below) is the most important of these moths and it emerges as adults during November to mid-January.
Grease bands are mainly used to protect fruit trees, such as apple, plum, pear and cherry. Note that sticky barriers give no protection against codling moth, the cause of maggoty apples. That pest has winged females that are active in midsummer.