I might have to beg to differ with you, keithl, on that final point. Unless the UK rules differ from Pans Ops in this regard, if the max IAS is shown as 185 knots on the chart, there's no way to avoid it at all. That is the maximum speed that a pilot can use, regardless of category.
The MDA (or DA) might be slightly higher for a higher category, but this will not guarantee obstacle clearance in the missed approach, at any speed above 185 knots. Indeed, if the reason for the speed limit is to restrict turn radius, the use of a higher speed could remove the aircraft from the protection area.