Norman Baker MP has stepped up his efforts against “destructive” Tasmanian forestry practices by sending Australian prime minister John Howard a protest letter signed by more than 100 MPs.

The letter, signed by former environment minister Michael Meacher, has been timed to coincide with Mr Howard’s visit to Tasmania in the run-up to the Australian elections. It urges Mr Howard to intervene in the state’s forestry practices.

Mr Baker, the Liberal Democrat’s environment spokesperson, now has the support of 104 MPs for his Tasmanian Early Day Motion, first penned earlier this year.

He said Tasmania’s government was endorsing and actively encouraging the destruction of the state through forestry practices which include old growth logging and use of the chemical 1080.

  He added: “I’m not saying I want the timber industry to stop. I want to see it change its practices.

Mr Baker said he had been “besieged” with emails from Australians and Tasmanians backing the campaign.

His motion, which has cross-party support, also discourages British tourists from visiting the state while current forestry practices remain in place.

Mr Baker’s office said there is a good prospect it will apply for a UK parliamentary debate on the issue.