LONDON (Reuters) - BRITAIN'S opposition Conservatives' hopes for a large election win have been boosted by a poll which puts the party well ahead in key parliamentary seats, the Daily Telegraph newspaper reported on Saturday.

The YouGov poll found voters were backing the centre-right Conservatives in the seats they will need to win from Prime Minister Gordon Brown's ruling Labour Party to secure a large majority at the next parliamentary election due by June 2010.

Most nationwide polls in recent months have put David Cameron's Conservatives well ahead of Labour. But an Ipsos MORI survey last Sunday showed Brown had cut the lead, with Labour on 31 per cent and the Conservatives on 37 per cent, which would result in a hung parliament - the first since 1974.

The Telegraph said the YouGov findings indicated that the Conservatives were faring better in marginal seats than nationwide, improving the party's chances of winning a significant victory.

The poll suggested that across the country as a whole the Conservatives were on 39 per cent and Labour on 29 per cent, which would leave Cameron short of a working majority.

However in 32 marginal seats currently held by Labour and potentially crucial in deciding which party will form the next government, the survey indicated a bigger swing in backing for the Conservatives. In these seats, the Conservatives led Labour by 42 per cent to 36 per cent while at the last election in 2005, the Conservatives polled 34 per cent with Labour on 44 per cent.

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