British Prime Minister Theresa May warned that MPs risk undermining the public's faith in democracy if they reject her divorce deal with the European Union in a vote set for Wednesday NZT.

May said some members of Parliament were playing political games with the Brexit debate.

MPs, she said, should respect the results of the 2016 referendum in which 52 per cent of voters backed leaving the EU.

Failing to do so "would be a catastrophic and unforgivable breach of trust in our democracy," she wrote in a commentary published by the Sunday Express.

"So my message to Parliament this weekend is simple: it is time to forget the games and do what is right for our country."

However, Former Tory Cabinet Minister and member of the select committee on exiting the EU, Lord Peter Lilley told Tim Dower the British public is "well prepared to leave with no deal".

He said so many things have gone wrong which have pushed them to this point 

"The negotiations have been extraordinarily badly handled. Beginning with the Prime Minister agreeing to talk about money first and agree that we would give them £39 billion without discussing what we would get in return."

"The answer is we aren't going to get anything in return. Instead, we will be stuck in an arrangement with the European Union which means we will be in a customs union, we won't be able to set our own tariffs or enter into trade negotiations with other countries, we will be in the single market so we will have to accept a whole range of European laws which the whole purpose of Brexit was to become responsible for our own laws, and we will actually have a barrier between Great Britain and Northern Ireland."

Lilley said the Government is in the position where it has to "frighten its MPs into voting for this deal".

"Saying if we don't there will be chaos." However, he said he doubts that."

"It's not too difficult to leave without a complex deal with the EU because we have said there will be no extra checks at the main pinch point which is Dover across the channel. The French have said there will be no extra checks on their side so that there shouldn't be the delays and blockages people have feared."

He said a large proportion of the population are happy to leave as long as there isn't another referendum.