In the phraseology mentioned in the OP, no specific 'clearance limit' is given, and is extremely ambiguous.
It effectively gives the a/c permission to enter the R/W via B and backtrack in order to get to R/W 10.
When I started in 1980, it was 'Cleared to the holding point R/W XX'.
This later became 'Taxy holding point R/W XX', with the word 'cleared' only used for T/O or Landing instructions.
Without checking CAP413, I believe the current procedure is to issue a taxy clearance to a specific holding point via a specific route?
Last edited by ZOOKER; 12th April 2018 at 20:14.