Funny that - that this came up the other day during cruise.
I can't speak for western Europe, but hopefully it jogs someones memory on where to find it or what the figures are - I imagine they are identical world wide though, considering the aircraft categories are, from my poor memory on the subject, an ICAO requirement and not a "by state" one.
Here in Canada the information is located in our Aeronautical Information Manual by going to the Instrument Flight Rules- Arrival Procedures - Circling section; and I quote:
The visual manoeuvring area for a circling approach is determined by drawing arcs centred on each runway threshold, and joining those arcs with tangent lines. The radius (R) of the arcs are related to the aircraft category as follows: A, 1.3 NM; B, 1.5 NM; C, 1.7 NM; D, 2.3 NM; E, 4.5 NM. (Category E circling minima are published at DND aerodromes only.)
The circling MDA provides a minimum of 300 feet above all obstacles within the visual manoeuvring area for each category.
If it is necessary to manoeuvre an aircraft at a speed in excess of the upper limit of the speed range for its approach category, the circling minima for the next higher category should be used in order to ensure appropriate protection from obstacles. Circling restrictions are published at some locations to prevent circling manoeuvres in certain sectors or directions where higher terrain or prominent obstacles exist. This practice allows the publication of lower minima than would otherwise be possible. In such cases, the circling MDA DOES NOT PROVIDE OBSTACLE CLEARANCE WITHIN THE RESTRICTED SECTOR.
I would imagine the speeds for the categories are the same, being:
Cat A: up to 90
Cat B: 91 to 120
Cat C: 121 to 140
Cat D: 141 to 165 and
Cat E: 165+
I hope this is the same answer you're looking for, but if not hopefully it jogs someones memory!
