I live in Norway and it was actually in a newspaper article where the Director of the Norwegian Institute for Public Health was interviewed along with a senior researcher from the Norwegian State Department for Medicines.
Here is a translation from the article, which I link to below.
NB for information, Norwegian health policy is ultra-conservative when it comes to medicine use, particularly in pregnancy. The guideline for alcohol in pregnancy has been total abstinence for over a decade now and most women here, on public guidelines, cut out coffee and don't even take paracetamol for headaches when pregnant. Mercury has been banned in Norway since January 2008 because of fears over the risks, but an exception has been made for Pandemrix because multi-dose vials was the only way to deliver enough doses to the time schedule they believed necessary. This convinces me of how seriously they are taking the threat of a second wave of the virus.
Here's the relevant part of the article, the same contents can be found in a Medicines Agency Report.
"Each dose of the vaccine Norway has delivery of, Pandemrix, contains 5 micrograms of Tiomersal, which contains 2,5 micrograms of quicksilver (mercury)."
" 'It is an insignificantly small amount. A woman weighing 60kg of childbearing age ingests at least 6 micrograms of mercury a week through her food intake," siad researcher Christian Syvertsen of the Medicines Agency to Aftenposten on Tuesday."
"Readers were not necessarily convinced. Many have read online that it is much worse to inject mercury than to eat it. "
" 'No, this is not correct. Ethyl mercury which is injected is flushed out by the body much quicker than methyl mercury which is the type ingested through the diet," says divisional director Hanne Nøkleby of the Institute of Public Health."
The link is here but I'm afraid it's all in Norwegian.
www.aftenposten.no/helse/article3322366.ece
The dietary habits here might be slightly different from the UK in that women eat more fish. You can google the mercury per gram content in various seafood items.
I did find this page on the WHO website about Thiomersal but it isn't specifically about Pandemrix.
www.who.int/vaccine_safety/topics/thiomersal/questions/en/index.html
Page 31 of this NHS briefing document on the H1N1 vaccinations also specifies the amount of Thiomersal (5 micrograms) of which mercury (2.5 micrograms) in the vaccine:
www.nes.scot.nhs.uk/hai/pandemic_flu/documents/H1N1trainerv1.028-09-09_000.pdf
The USA FDA says that methylmercury is the main source of human mercury exposure, through fish and shellfish and that other forms of mercury are minor contributors to human mercury exposure. Further the EPA (Environmental Protection Agency) specifies a reference dose (RfD) which is "an amount of methylmercury, which when ingested daily over a lifetime is anticipated to be without adverse health effects to humans, including sensitive subpopulations. At the RfD or below, exposures are expected to be safe. The U.S. EPA derived a RfD for methylmercury of 0.1 µg/kg bw/day (microgram per kilogram of body weight per day)." So for a person who is 120 lbs (or 55 kg), the reference dose for methylmercury would be 5.5 micrograms per day.
www.epa.gov/mercury/reportover.htm
www.epa.gov/fishadvisories/advice/factsheet.html
Hope this provides some pointers if you are looking for more info.
I have to say I have been following the topic quite closely in the Norwegian and British press at home and think the Norwegian press has been better at pinning down public health experts and putting the questions of worried readers to them in order to get fact-based answers, whereas the British press has focused very much on the sensational stories, people who died, people who nearly died but miraculously didn't, dragging up horror stories from historical drug scandals etc.
Over here we are also only offered Pandemrix, and the normally hyper-cautious and conservative public health body is 100% encouraging pregnant women to have the vaccine, against all precedents. While there has not been the same peak or number of cases here as in the UK, they are predicting that cases are on the rise this week and possibly up to a quarter of the population could be infected by Christmas.
They stress that for most people, including pregnant women, it will be a mild illness, nothing to fear and with no serious consequences, so no reason to panic. But because there is no way of predicting which otherwise healthy women are the unlucky few that will develop dangerous or even fatal complications, they want to follow the WHO guidelines which is to vaccinate us.