Thanks 41Sqn; attached is another explanation of boost types used by RAF engines from R A Beaumont A.F.R.Ae.S "Aeronautical Engineering: A Practical Guide for Everyone Connected With the Aero Industry"
(3) Override Boost - For the greatest possible power output for take-off or emergency, an increase in pressure above the normal take-off boost is permitted on some engines. This condition is used in conjunction with a special fuel. (p. 106)
The wording is similar to A.P.129, apart from noting that override boost was used in conjunction with a special fuel.
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