The oak longhorn beetle (Neocerambyx raddei) and two-lined chestnut borer (Agrilus bilineatus) are now on the GB quarantine list, and as a result new measures apply to importation of wood, wood chips, plants for planting and isolated bark from certain host plants (from specific third countries) - see the regulation amendments listed here.

Images: two-lined chestnut borer (Agrilus bilineatus) - Hanna Royals, Screening Aids, USDA APHIS PPQ, Bugwood.org [left], and oak longhorn beetle (Neocerambyx raddei) - Bob Parks, Screening Aids, USDA APHIS PPQ, Bugwood.org