At a place I visit, the reply from A/G to "Ready for departure" is usually "At your discretion".
tut tut, that should be reserved for AFIS and a FISO not an A/G operator.
Refer CAP 413 5.4.2
NOTE: Air ground operators must not use the expression ‘at your discretion’ as this is associated with the service provided by FISOs and is likely to cause
confusion to pilots.