They played about with the Valiant BK1 with JATO. One of the problems was where to drop the spent rockets before continuing. This would use up all the fuel that you had saved.
It was overcome with the water meth injected Avon 205A which produced 10% extra (10,000lbs/11,000lbs) for one minute.
1410 lbs of water meth lasted exactly one minute; precisely the time that the mainwheels left the ground at Embakasi.