The hustings was much to long to report in full, so we've provided summaries to three of the questions here to give you a flavour of the night.

Question: Recent studies show that the UK may have up to a million immigrants who have either entered the country illegally or stay here without permission. What is the fairest, most humane way of resolving this immediate problem and then ensuring that it does not happen again?

* UKIP's Strachan McDonald pointed out the difficulties in dealing with people who could not be easily traced.

“It's a logistical exercise which is beyond comprehension,” he said. “We should never have got into this position in the first place.”

* Independent Susan John-Richards expressed her sympathy for asylum seekers and told of a man she has been helping at Colnbrook detention centre.

However, she said the issue needed to be dealt with “on balance”.

* Green Roy Vickery said he was “relaxed” about immigration, and said the Iraq and Afghanistan wars were partially to blame.

He said: “We are responsible for creating an unpleasant situation, and then we say they should stay there and live happily.”

* Liberal Democrat Nasser Butt advocated border controls but suggested giving current illegal immigrants an “amnesty” so that they could become citizens and live within the law.

He said: “It works in Australia, it works in Canada. It can work here.”

* Conservative Mark Clarke said it was not “bigoted” to raise the issue of immigration, in a blatant reference to Gordon Brown's gaffe earlier in the day.

He accused Labour of creating strain for services by implementing an “unplanned” immigration policy and advocated an annual limit.

* Labour's Sadiq Khan pointed out that in the last two years there have been more people leaving the country than coming in.

He said an annual limit would be impractical because it would stop students, workers and spouses from entering in the latter part of the year.

“What happens when we get to the cap?” he said. “Are we going to say stop falling in love?”

Question: Does climate change fit in to your top five political priorities? If yes, where? If no, why not?

* Green Roy Vickery confirmed that it was his first priority, adding: “It's the people who are the poorest who suffer first.

"The rich people jet off to parts which haven't yet suffered, and the poorest are left behind to try and pick up the pieces.”

* Liberal Democrat Nasser Butt said it was a “distinct” priority and outlined his party's plan for more environmentally-friendly homes, with the expansion of wind turbine and energy industries.

* Labour's Sadiq Khan said climate change was his first priority and highlighted Labour's achievements in reducing carbon emissions.

But said more must be done – especially in conjunction with countries around the world, adding: “We need to have micro solutions and macro solutions to save the planet.”

*Conservative Mark Clarke said climate change was number three on his list of priorities, after the economy and the NHS.

He advocated treating it in a “proportionate manner”, adding: “People have often been too alarmist about the challenges we have been facing. That's undermining public confidence.”

* UKIP's Strachan McDonald earned a few chuckles by saying: “It would be high on my priorities if I would bring myself to believe in it.”

He raised fears over the cost of climate change work, and warned against anyone taking “stupid” actions.

* Independent Susan John-Richards pointed out the detrimental effect of the industrial revolution on the environment and said climate change was not a myth.

She added: “Environment is important, whether we like it or not, so we should respect it.”

Question: What can you do to convince us that you will be squeaky clean if elected for Tooting or is that an impossible stance for anyone who has stood as an MP?

* Labour's Sadiq Khan said he published a full account of his expenses on his website.

When challenged by a heckler, he denied any investigation had been conducted into money he spent on greetings cards to constituents.

He accused Mr Clarke and Mr Butt of “casting aspersions” on him via leaflets and added: “It was a good way of throwing mud at my reputation”.

* Conservative Mark Clarke advocated the need for tougher regulation of public money.

“I won't use my communications allowance for any purpose,” he said. “I will not spend £2,500 on greetings cards.”

Responding to a heckler, he denied receiving money from Lord Ashcroft.

* UKIP Strachan McDonald said reliance on the Parliamentary system was at fault when it came to corruption.

He said: “If you want true independence, people should be less dependent on their Parliamentary salaries.”

* Independent Susan John-Richards, who previously sat on Wandsworth council, said integrity was key and claimed she did not even use the stamps she was given as a councillor.

“I'm coming here to represent the ordinary voter who would like to have a clean MP,” she said.

“Not a career politician. Not a smart, upgraded salesman.”

* After a heated debate over arguably the most contentious issue of the night, the audience welcomed a more light-hearted response from Roy Vickery, Green candidate.

“I thought if I got elected, what would I do with the money,” he said.

“I scratched my head and thought, perhaps I'll buy a new tie. I think you have guessed the answer to that. Don't bother Roy, no-one will see it.”

Click here for a photo gallery from the event