Simpson announced his move as he appeared at a press conference in Scotland with Reform leader Nigel Farage.
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Blair joins White House meeting with Trump on post-war Gaza
The talks come as Israel prepares to seize Gaza City as a step towards full control of the territory.
What we know about the Minneapolis Catholic school shooting
Two children aged eight and 10 have been killed and 17 more people have been injured.
Apple warns UK against introducing tougher tech regulation
The iPhone maker is pushing back against proposed changes required by the UK competition watchdog
'Humiliating!' Club Brugge thump 10-man Rangers 6-0
Russell Martin's Rangers side suffer "one of the most embarrassing nights in their European history" as they are demolished 6-0 by Club Brugge after going down to 10 men to lose 9-1 on aggregate...
Home Office set to halve time asylum seekers spend in hotels
The time given to people granted asylum to move from hotels to their own accommodation will be cut from 56 to 28 days.
'Bradley avoids sporting masochism to make Europe's Ryder Cup harder'
US captain Keegan Bradley tells BBC Sport that not playing at the Ryder Cup "hurts", but he views his role as the "ultimate job".
Denmark apologises to Greenland's forced contraception victims
Mette Frederiksen says sorry to to women who were fitted with devices, sometimes without their knowledge.
Ed Davey to boycott Trump state banquet over Gaza
The Lib Dem leader says he wants to send the president a message that he has the power to end the crisis.
'I need to look after myself' - Draper out of US Open with arm injury
British number one Jack Draper withdraws from the US Open because of an arm injury.
What is on the table at Trump’s Gaza meeting?
And Labour is back to talking about Brexit.
Tommy Robinson will not be charged over St Pancras incident
British Transport Police said prosecutors concluded there was not enough evidence to bring charges in connection to the incident.
Tommy Robinson will not be charged over St Pancras incident
British Transport Police said prosecutors concluded there was not enough evidence to bring charges in connection to the incident.
'Something I've wanted my whole life' - Lake makes British history with 2m leap
Morgan Lake makes history as the first British woman to clear two metres in the high jump at the Diamond League Final in Zurich.
Ryanair to increase oversized bag bonus for staff
Michael O'Leary told the BBC the change would come in November, and that he made no apology for it.
'I'm not a wild animal', says alleged sex attacker
Hadush Kebatu, an asylum seeker staying at The Bell Hotel in Epping, denies five charges.
Is Trump right about wind power and UK energy bills?
President Trump has suggested this week that wind power is the reason for rising energy bills in the UK. BBC Verify's Ben Chu takes a look at the data.
Russian drone attacks cause massive power cuts, Ukraine says
More than 100,000 homes are without power after the latest Russian strikes on energy sites, President Zelensky says.
Raducanu starting to 'embrace expectation' at US Open
Emma Raducanu overcomes a potential banana skin as she clinically beats Indonesian qualifier Janice Tjen to reach the US Open third round.
Solar-powered postboxes being rolled out across UK
Royal Mail says the revamped design will help it compete in small parcel deliveries.
Solar-powered postboxes with parcel drawer rolled out across UK
Royal Mail says the revamped design will help it compete in small parcel deliveries.