Dealt with here already:
http://www.pprune.org/forums/showthread.php?t=234358
Or for those too lazy to click:
UK AIP Section 1.7 Differences from ICAO Standards (specifically Doc 8168 - Procedures for Air Navigation Services - Aircraft Operations Volume II -Construction of Visual and Instrument Flight Procedures)
Section 1-7-52
Chapter 7
7.3.2
Procedure Construction and Obstacle Clearance Criteria for Instrument
Approach Procedures (cont)
Missed Approach Segment
Turn parameters - IAS. Unless otherwise specified,
all missed approach turns
are limited to 185 kt IAS maximum.
Hope this helps!