srs what?
Your options appear to omit one rather relevant option mentioned in CAP 410:
Aircraft at the holding position of runway to be used for departure ready for take-off
Phraseology:
(Aircraft callsign) hold position.
(Aircraft callsign) take off at your discretion, surface wind
(number) degrees (number) knots.
(Aircraft callsign) traffic is (traffic information) take off at your
discretion, surface wind (number) degrees (number) knots.
Note the first option.