He took the newly configured Dwyfor Meirionnydd seat at the 2010 British general election with 44.3% of the vote, but there was a 7.3% swing from Plaid Cymru to the Conservatives.

[citation needed] Having been elected to public office, his main political interests are home affairs, transport and agriculture.

[6] In September 2001, Llwyd alluded to Plaid Cymru councillor Seimon Glyn's controversial remarks about a "tidal wave" of English retirees emigrating to Wales[7] and restrictions on second-home ownership proposed for Exmoor National Park when he observed that "it is fine for Exmoor to defend their community but in Wales when you try to say these things it is called racist".

[10] Llwyd argued "The language now being used in Exmoor is exactly the same issues as in Wales except that we have an added dimension in Wales of the language and the culture" and called on other parties to join in a debate to "talk about the Exmoor suggestion and see if we can now bring it into Wales"[8] The following spring Snowdonia National Park (Welsh: Parc Cenedlaethol Eryri) and Pembrokeshire Coast National Park (Welsh: Parc Cenedlaethol Arfordir Penfro) authorities followed the example set by Exmoor and began limiting second home ownership within the parks[11] In August 2004 Llwyd joined Adam Price in a campaign to impeach then Prime Minister of the United Kingdom Tony Blair over the alleged misleading of the UK Parliament and for allegedly making a secret agreement with then US President George W. Bush to overthrow Saddam Hussein, amongst other charges.

[6] In November 2005, the campaign announced a new motion (this time with the support of the Liberal Democrats) asking for a Commons committee to examine the conduct of ministers before and after the war.

In March 2007 Elfyn Llwyd was one of three individuals who made complaints about the Labour Government under section 1 of the Honours Act 1925 to the Commissioner of the Metropolitan Police.

However, the committee found that the three used this communication allowance improperly as part of Plaid's campaigning during the elections as the adverts were placed in publications with a circulation outside of their respective constituencies.

[14] At the Llandudno party conference 2007, Llwyd encouraged the party to nominate peers into the House of Lords, citing that Plaid peers would "help ensure planned legislation for Wales was not blocked at Westminster", adding that many in the Lords may want to prevent full law-making powers for Wales.