Pollarding is more for Willows as the resulting trunks formed from Lime are
not very strong and are often tied together to strengthen them.
With lime tress the old practice was known as Pleaching, this is well
described in
http://shopping.guardian.co.uk/Print...538311,00.html
The annual pruning of pleached lime trees is done Autumn/ Winter.

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk