There was a thread on this issue not too long ago - you may be able to find it in the archives.
I believe uncle dickie is correct; the 185kt speed limit is only applicable where there is terrain avoidance required in the G/A. At Heathrow we would normally expect you to get the aircraft clean in accordance with your SOPs, following the published missed approach. At some stage during this you will be given a vector to get you back into the sequence and Director will usually request a speed when you recall him. You can expect that to be about 210kts but we can work with your preference if we know it.
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