Similarly in UK most of country is on TA of 3000' (though Snowdon 3560' amsl is also in this area) but Scottish FIR has TA 4000' (Ben Nevis 4406' also above it - but gives about 500' clearance between the FL that is 1000' above TA and the ground if the pressure is at or above 1013.
No idea where you get that from, but it's wrong. The TA in Scotland is 3000' except for within some areas of controlled airspace.
UK AIP Altimeter Setting Procedures
(Note: you need to be registered with the NATS AIS site to access the document).
The UK doesn't publish Transition Levels as such, instead, they give a table from which you can find out the minimum Flight Level to cruise at based on the minimum altitude you want to fly at and the actual QNH. This table is found in the link above.
Alternatively, you can ask an ATS unit for the lowest Flight Level available. This may or may not be the Transition Level. For those in Controlled Airspace, this level will provide a minimum of 1000' vertical separation above the Transition Altitude.