While on the subject of additives anyone used Wynns Dry Fuel? I have had a problem with my modern road car for ages and I was informed that the problem may be related to water in the fuel tank which can be caused just by condensation building up in the tank.
I tried a bottle of 'Dry Fuel' and it made a big difference to the car's running. I know126's are prone to fuel related problem blocked jets etc and some owners lay their 126's up for the winter when condensation is likely to build up.
Well worth trying even if you don't have any current problems, bottle costs £6.50 (Halfords) and the treatment lasts for 6 months.