http://www.stargreen.com/find?Q=fm

Well at least according to Stargreen and offical Thin Lizzy website, would have thought they'd have been an announcement on here unless I missed it.

yep it is on the TL band website touring one that is

In addition Thin Lizzy has added a special guest act (in addition to the
already announced Supersuckers) to the following shows on their forthcoming 2011 tour.

FM will guest at London Hammersmith HMV Apollo - January 22nd.

The Union will guest at
Glasgow Academy January 7th
Newcastle City Hall January 8th
Wolverhampton Civic Hall January 14th
Manchester Apollo January 15th
London IndigO2 January 23rd

FM - the legendary UK AOR band reformed three years ago, releasing the
critically acclaimed album "Metropolis" in March 2010. The new album has
produced two Radio 2 playlisted singles "Hollow" and "Bring Back Yesterday"
which sit alongside such past classics as "Frozen Heart", "American Girls"
and their cover of Marvin Gaye's "Heard It Through the Grapvine". 2010 also
saw the band grace the main stage at the Download Festival.

Is this comfirmed by FM themselves?

The guys confirmed they would be appearing at the Thin Lizzy show in the latest FM newsletter