exercise to emphasise the Conservatives' commitment to environmentalism; a project costing £40,000 resulted in a sketched silhouette of an oak tree, a national symbol, which was said to represent "strength, endurance, renewal and growth". However, there was criticism from within the party; former chairman Norman Tebbit remarked on national radio that the new green logo resembled "a bunch of broccoli". It had been intended to unveil the emblem at the party conference, but a leak to the press resulted in it being launched a week earlier. A change from green to the traditional Conservative blue colour appeared in 2007, followed by a version with the Union Jack superimposed in 2010. An alternative version featuring the colours of the Rainbow flag was unveiled for an LGBT event at the 2009 conference in Manchester. Party factions The Conservative Party has a variety of internal factions or ideologies, including one-nation conservatism, social conservatism, Thatcherism, traditional conservatism, neoconservatism, Euroscepticism, and Christian democracy. Traditionalist Conservatives This socially conservative right-wing grouping is currently associated with the Cornerstone Group (or Faith, Flag and Family), and is the oldest tradition within the Conservative Party, closely associated with High Toryism. The name stems from its support for three social institutions: the Church of England, the unitary British state and the family. To this end, it emphasises the country's Anglican heritage, oppose any transfer of power away from the United Kingdom—either downwards to the nations and regions or upwards to the European Union—and seek to place greater emphasis on traditional family structures to repair what it sees as a broken society in the UK. It is a strong advocate of marriage and believes the Conservative Party should back the institution with tax breaks and have opposed the alleged assaults on both traditional family structures and fatherhood. Most oppose high levels of immigration and support the lowering of the current 24‑week abortion limit. Some members in the past have expressed support for capital punishment. Prominent MPs from this wing of the party include Andrew Rosindell, Nadine Dorries, Edward Leigh and Jacob Rees-Mogg—the latter two being prominent Roman Catholics, notable in a faction marked out by its support for the established Church of England. One-nation Conservatives One-nation conservatism was the party's dominant ideology in the 20th century until the rise of Thatcherism in the 1970s. It has included in its ranks Conservative Prime Ministers such as Stanley Baldwin, Harold Macmillan and Edward