A court has heard how the Conservative party was concerned it could exceed spending limits in the fight to win the South Thanet seat at the general election in 2015.

Marion Little, one of three defendants on trial at Southwark Crown Court, was drafted in to help co-ordinate the campaign.

She has denied any wrong-doing concerning the election expenses returns.

She was asked by defence counsel about an email in which local party chiefs expressed worries that the party could end up breaching limits on spending.

The email said "we face a real prospect of a legal challenge by Farage... we cannot make the smallest slip up."

Asked what the email meant, Mrs Little said the seat "was a top priority" and Nigel Farage "had invested a lot in it" and that he had threatened to resign if he failed to win.

"So we had to be very careful that we stayed within the law and the legal limits," she said.

Asked by defence counsel Jim Sturman about whether she had played "fast and loose" with the rules on expenses, she said: "Absolutely not, I would never do that."

She denied she had been tempted to "squirrel away" money which had it been spent on the campaign would have taken it over spending limits.

She told the court the Conservative party had realised that it faced a "serious problem" after Ukip held its annual conference at Margate.

"It became very obvious that South Thanet was going to be very much the media centre for the campaign. It became top of the list."

She denied she had wanted to be the election agent and said her role was to co-ordinate the national campaign against Ukip rather than run Craig Mackinlay's campaign.

The court heard how the party had during the final days of the campaign, the party had mislaid 500 leaflets designed to be sent to voters.

Asked about the incident, she said there was confusion about the missing leaflet and denied it was a way of limiting the expenses returns.

"They had just disappeared, they could not be found. We reordered some more but I was keen to ensure we had no more than 500."

She was asked about a visit by former footballer Sol Campbell to support the campaign but had arrived without a pair of trainers and that she had gone out to buy a pair.

Asked if she had claimed the money back, she said she could not recall if she had.

Mackinlay denies two counts of "knowingly making a false declaration on an election expenses return", contrary to the Representation of the People Act.

Gray denies one count of knowingly using a false instrument "namely in respect of the election expenses return for the long campaign period".

He also denies "knowingly making a false declaration on an election expenses return".

Little denies three counts of "intentionally encouraging or assisting an offence" in relation to the expenses returns.

The trial continues.