My car is all sorted now after the filter change - power is there on the pedal again.
When I had the issue, it would 'stutter' as you accelerated, usually giving a bit more as you joined a motorway or such like.
As you accelerated, as it started to stutter, if you eased off, then started to apply the gas more gently, it was fine, and you could ride through the gears, and up the speed to 60-70 and it was fine.
However, last week or so, it was getting worse. I still have the filter that was removed - it is very black, and slightly deformed, which is due to it being blocked, and trying harder to suck the fuel through it, apparently.