I looked at the Uk restrictions on importing plants over Christmas and recall no restrictions. Here is a link to the UK gov. leaflet on the matter
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/354767/plant_product_leaflet_aug_2014.pdf and a couple of quotes read:
Within the EU, you can bring in any plant products,
other than plants and seeds of Fraxinus (Ash) and
Castanea (Sweet chestnut) and plants of Platanus
(Plane) intended for planting – as long as they are
grown in an EU country, are free from pests and
diseases and are for your own use or consumption.
With regard to seeds:
Seeds for planting
(but not potato seeds)
You are allowed to bring
a maximum of five retail
packed packets of
restricted seed without a
phytosanitary certificate.
Please note that not all
seeds are restricted. For a
complete list of seeds that
are restricted, contact Fera
– their details are on the
back of this leaflet.
Seeds of Fraxinus (Ash)
for planting