It's not the leaves it's the sticky sap that comes from a silver birch Please only constructive comments
So, am i within my rights to prune the tree and offset the cost to the park owners by reducing the cost of my fees.
Please only constructive comments
NO MORE COMMENTS PLEASE
As for pruning birch trees, done at the wrong time of year it can lead to their bleeding to depth as the sap runs so freely. It needs to be done when they're dormant and before the sap starts rising again in late winter so September to December will be best.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
However, I sympathise, tree sap is a nightmare, although it can be removed by softening with an oil-based soap and scrubbing. Cleaning and sweeping of leaves is your responsibility during changeover between rental guests and it is actually not an unreasonable suggestion to leave a brush out for guests.
At least the site owners have agreed to prune it back and they are right to delay this until Autumn/early winter when the sap is no longer rising. Try to encourage them to prune it back sufficiently so it no longer overhangs your deck.
To make the deck useable in the meantime (after thorough cleaning) you could install a pergola or sail shade to protect it from the sap/leaves.