After slaving away all night over a pan of base i decided to try methods that would be quicker or releave me from the pot.

I did one batch of SNS in my slow cooker leaving it for 12 hours in total (tinned toms in for last 2 hours after blending (with stick insitu).

I also did the same SNS in a pressure cooker for 30 mins.

Results.

The slow cooked one came out thicker.
The pressure cooker one was runnier after blending but the veg was far softer. I then boiled it with the lid off for 15 mins to thicken it.
Either way i found the end result not much different from the standard hob method.

If I was forced I'd choose the pressure cooker simply as it takes less time.

The pressure cooker sounds like a good idea and may help reduce the amount of smell you create when making a base.

My Indian work mates swear by them for speeding up the cooking of lentils.