Scots' kick from inside the 22...

At the start of the second half v Wales, the Scots fielded the ball outside the 22 - it was then passed back (to Barclay, I think) who was inside - he was tackled just about on the line. Scots rucked the ball back, the ref said "Inside" and they kicked it direct to touch on halfway.
Surely, this was a cock-up by the ref? Should have been a lineout inside the 22? Or did I miss something?

If he was tackled & the ball was on the 22 or inside the 22, Mr Clancy was correct, as by definition, the tackle starts a new Phase of play, so there is NO pass back.

However, if the ball was outside the 22 (i.e. not on the line or behind) & rucked back into the 22, then the kick would have been deemed to be "straight out" as a result of being "taken back in" to the 22.

Generally that is normally when the Mark of the lineout is outside the 22 (albeit only by an inch or so) & the ball is tapped back into the 22.
As far as the Law is applied, a new phase is generated after one of the following

• Following a "Tackle"
• Following a "Maul"
• Following a "Ruck"

& the obvious ones

• Following a "Scrum"

• Following a "Lineout"