Well I went ahead and ordered the Aldi router. It's taken somewhat longer than expected because the one they initially sent was missing the cover for the bottom of the base plate. The replacement has now arrived and certainly looks and feels like good value after a few test cuts.
Compared to more expensive routers the pressed steel guide fence seems a bit lightweight but seems to do the job OK.
The guide bush has a rather unconventional shaped fixing plate instead of the usual circle, this could be a minus point for a more serious user because you're limited to just the one size bush but that's not likely to be a problem for my fairly basic needs.
The guide fence can be turned upside down and fitted with a centre pin to enable circles to be cut up to about 10 inch radius.
A rather odd accessory is the roller guide which can be bolted onto the guide fence, apparently for following curved surfaces or . I would expect this will only work if the imaginary line through the centres of the roller and cutter is kept perpendicular to the surface of the curve being followed. In the absence of any way of forcibly constraining this the router could easily wander away from the desired path towards the edge of the work.
I also bought a set of Aldi's router bits. It turns out that these are not accurately described on the website which gives the maximum speed as
30,000 rpm but they all have a maximum speed of 24,000 rpm engraved on the shank and it's down to guesswork what number on the speed dial corresponds to 24,000 rpm. But at only 10 quid they're a good starter set.