I can't remember exactly (I had something else done at the same time so the total bill wasn't just for tracking). I just remember it being surprisingly cheap. I want to say £39.99 or £49.99.
They quoted me a higher number (somewhere around £125 I think) but I went with them anyway. I had it done elsewhere but it wasn't right so went to LR to get it done right. Their quote was high but I just considered it the cost of getting it done right.
When I came to pay the cost was much, much lower than their initial quote.
They also said that some of the parts were rusted solid and needed a lot of work to free them up - they don't know how the other place claimed to have done the tracking and then charge me for it. It explained why it didn't feel right after being done elsewhere though - they'd done half a job.