Ok I have received no letter only a partial practice booklet for the assessments (all but computer tests) The tests listed include the obsolete reaction and mechanical tests however the practice material is correct.
No accompanying letter so must have been an oversight
Will not be progressing as I have since been successful and put on hold for a mainline position
I'm in the same boat as you mate.
I only received the booklet and no accompanying letter.
I have since had a phone call inviting me to the interview stage.
I've completed all the assessments with my current TOC and EMT have informed me that it's not necessary to carry them out again .
But like you I have now been offered a mainline position with another company.