The areas of grass in question are not of a suitable quality for a cylinder but rotary mowers seem to have their wheels right at the extremities so that you are always in danger of falling over the edge or else leaving an uncut edge.
I have found an undated leaflet for the BCS Tracmaster that offers flail mowers.
Perhaps that would fit the bill?
I am interested in the power harrow and stone burier that can also be fitted to the tractor unit, but I am wary of claims as to how easy it is to change the implements.
Firstly, regarding mowing the grass, even the best of rotaries will take some serious concentration when following the edge of a border. Another possibility would be an air-cushion mower, such as the Flymo Hover.
But, of course, you want a petrol model. My suggestion would be the HM 19H4 from Lloyds & Co (Letchworth). This mower is really powerful and it would be an advantage if you have shrubs to cut beneath, slopes or paving slabs across the grass.
I also reckon that the leaflet you found is worth following up. I am a fan of the BSC 638 and 740 two-wheel tractors from Burgess Hill-based Tracmaster. The 738 has a width of 64cm and prices start from £2,095 + VAT. There is a choice of petrol or diesel engine.
The 740 model, also with either petrol or diesel engine, is 75cm wide. Both machines can power the 85cm-wide flail mower from Tracmaster — though clearly the biggest margin comes from using the 738 power unit.
The flail mower will cut down as low as an inch (25mm) and it has a full-width steel roller to prevent scalping — and it leaves a good finish. The mower costs from £1,295. The power harrow and stone burier also impress me.
Changing implements is a breeze with the optional quick-release system. It is well worth it — simply pull the clip, walk the power unit to next implement, line it up, pull together and re-clip.
Your nearest dealers are Hendersons at Kinross or Inverurie Garden & Machinery Centre. I would advise you to pay them a visit and ask for a demonstration.