Stop Hinkley are joining people from Kick Nuclear and C.N.D in London yesterday to show their support for a judicial review of the planning decision for Hinkley C.
Stop Hinkley were unable to initiate a judicial review themselves due to changes in the planning law that have making it harder for local communities to bring a case.
The time allowed has been reduced from 12 to six weeks making it very difficult to get a review of such a complex case.
Spokesperson Nikki Clark said: "We're very pleased that the decision is being challenged, in an odd way An Taisce's case is like a proxy for us - we were denied a voice on nuclear issues in the new infrastructure planning process, so we would be very pleased to see international law upheld. "
"The Irish are concerned that they haven't been consulted over the UK's planned nuclear power station.
"The ESPOO convention obliges countries to consult with their neighbours if they are planning a development that may have a significant impact on them, such as a nuclear power station.
"It is a salient reminder to government that whilst they can undermine human rights under domestic law, it's much harder for them to do so under European Law.
"We wish the people of Ireland every success with their essential challenge to the British governments unjust planning regime."