There have been recent press reports that GM tree researchers in the UK see this as an ideal time to revive efforts to introduce GM trees.
http://www.gmwatch.eu/archives/24-Bid-to-plant-GM-trees-in-UK.html

The Forestry Commission - the public body charged with protecting and enhancing forestry in Britain - has responded with a press release.
http://www.forestry.gov.uk/newsrele.nsf/WebPressReleases/8244977AED3E8774802574A4003B92D4

This says that as regards "requests for it or its scientific research agency, Forest Research, to host field trials of genetically modified trees on land they manage", the Forestry Commission does not see GM trees as a priority, and they are not themselves undertaking any GM tree research, but they are working on establishing a protocol for considering requests by other researchers to conduct GM trials on Forestry Commission land.

The work on this protocol by the FC provides an opportunity for some lobbying of a very PR sensitive government body.

If enough people contact the FC before they get their GM trial protocol cast in stone, they might be persuaded that letting GM trees out in the national forest estate is a bad idea.

Contact details for the FC are here: http://www.forestry.gov.uk/forestry/HCOU-4U4HZS

It's also possible for individuals and groups to lobby their local forestry forum, at least if they are in Scotland where these seem most developed. Details here: http://www.forestry.gov.uk/forestry/infd-6agllr

For information on the many concerns about GM trees see:
http://www.gmwatch.eu/archives/24-Bid-to-plant-GM-trees-in-UK.html

FC's current GM policy position is here: http://www.forestry.gov.uk/website/forestresearch.nsf/ByUnique/INFD-5SUK5C

It includes the statement, "The development of genetically modified (GM) trees is not an objective of the Forestry Commission." It would be good if this could be extended to, "Facilitation of the development of genetically modified (GM) trees by others on our land is also not an objective of the Forestry Commission."