MPs are expected to learn this week whether they will have to follow MSPs and list details of all their travel expenses.
After the loss of a landmark Freedom of Information (FOI) case, the Commons authorities are due to make a decision on the practicality of continuing their legal battle with the Information Commission over publishing every aspect of travel - including taxi and car rides, train trips and flights.
At present, unlike their Holyrood counterparts, politicians at Westminster only give general figures and no details. An Information Tribunal rejected two appeals by the House of Commons Commission that revealing details about members' spending would breach privacy under data protection.
The commission can either accept the tribunal's ruling and publish the travel details of all 646 MPs or appeal to the High Court. Last autumn, it was revealed that Eric Joyce, Labour MP for Falkirk, ran up £174,811 - the biggest expenses bill for 2005-06. On average, MPs claimed £125,377 on top of their £60,277 salary.
Mr Joyce, 46, also ran up the highest bill in terms of MPs' travel with costs of £44,985. The former Army major said at the time: "I am clearly taking more flights than my colleagues.
"It is legitimate but, when I look at it, it is clearly not sustainable so I will do something about it."
By contrast, Michael Connarty, Labour MP for neighbouring Linlithgow and East Falkirk, had travel expenses of £21,945 while the furthest-flung MP, Alistair Carmichael, Liberal Democrat MP for Orkney and Shetland, notched up £38,559.
Giving full details has proved problematical for some politicians. David McLetchie, former Scottish Tory leader, resigned after a row over taxi claims.
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