The Prime Minister, who is due in Belfast this morning for what he has described as last-chance talks, has proposed that the Ulster Unionist Party (UUP) should accept Sinn Fein in a new government without prior decommissioning by the IRA. In return, he offers Unionists "cast-iron" guarantees that the IRA would complete decommissioning by May 2000. If this did not happen, then the executive could not continue.The plan appears unlikely to find easy acceptance among either Unionists or republicans. The UUP has made it almost an article of faith that decommissioning must begin before an executive is formed. For their part, republicans speak of decommissioning as something which might happen, if at all, in the distant future.The fragility of the peace process was yesterday underlined by the interception of a large bomb apparently destined for the city of Londonderry. Gardai in the Irish Republic foiled the bombing mission, which appears to be the work of renegade republicans, as the device was being taken from the Co Donegal town of Letterkenny towards Londonderry. A van stopped at a garda checkpoint was found to contain bomb-making parts.Two arrests were made during the operation, following which the Royal Ulster Constabulary launched a search of a number of homes in the Creggan district of Londonderry. A major bomb attack such as was evidently planned would clearly have provided the worst possible backdrop for the attempt to make political progress.As a prelude to the main talks in Belfast, the UUP leader David Trimble went into early morning talks at Downing Street yesterday.

These did not include Mo Mowlam, the Secretary of State for Northern Ireland, with whom Mr Trimble does not get on. The Cabinet also discussed Northern Ireland yesterday, while Mr Blair will this morning meet the Irish Taoiseach, Bertie Ahern, in London before they fly to Belfast together.The Government made it clear yesterday that a breakthrough in the talks would mean power could be transferred to a new Northern Ireland government without delay. Margaret Beckett, Leader of the Commons, told MPs that if an agreement was reached, Ms Mowlam could put forward a devolution order in the House next Thursday, the day after the deadline set by Mr Blair.. BRITAIN WAS last night resisting calls from a number of European countries - led by France - for a two-year ban on planting genetically modified crops. The Department for the Environment, Transport and Regions said that agreeing to the deal would amount to a moratorium which would be illegal under EU law. In Brussels, Michael Meacher, the environment minister, opposed calls by his French counterpart Dominique Voynet for a meeting to agree a freeze. Mr Meacher said that existing British controls were adequate, including a voluntary ban on large-scale commercial plantings until safety tests had been completed. Last night one of Britain's biggest unions - the GMB, led by John Edmonds - called for a full independent public inquiry into the safety of GM products "as the only way of restoring public confidence in GM produce".The union's appeal was contained in letters to Mr Meacher and the Prince of Wales, a leading critic of GM.

It claimed that 600,000 jobs were at risk unless consumer confidence was restored. The BSE crisis led to the lost of 37,000 jobs in agriculture, and the union said it did not want to see job losses among its members.In a further blow to the Government, an all-party committee of peers and MPs yesterday criticised new regulations requiring labelling of GM products for failing to give adequate protection to consumers."People are in danger of purchasing GM foods without realising it. The government is at fault in law," said its chairman, Tory MP David Tredinnick. The regulations came into force on 19 March but provide no penalties for traders selling GM food without volunteering information on it unless consumers make enquiries.The Group of Eight world leaders on Sunday called for an international inquiry into the safety of modified food.In the face of pressure from at least five EU states, officials were last night trying to draft a statement designed to clarify Europe's opposition to the granting of new licenses until new regulations are in place.France called for a "declaration, with the active cooperation of the [European] Commission, which would stop a member state being exposed to a legal challenge".The French plan for a political statement would commit the EU to suspending any new GM crop approvals, or allow individual countries to block licences for environmental reasons. Peter Jorgensen, a spokesman for acting EU Environment Commissioner Ritt Bjerregaard, said: "The aim is a declaration which will underline what is current practice - that there isn't and won't be a sufficient majority for new products." France, Greece, Italy, Denmark and Luxembourg supported the temporary end to GM approvals.The Commission has put new applications on hold after research indicated that a breed of butterfly might be endangered by the effects of GM.However the British government argues that UK safeguards are satisfactory and says the French move would prevent any new decisions until 2002, in contravention of existing European law.That would open up the prospect of legal action from producers in addition to trade objections through the World Trade Organisation.