Probably here somewhere but I couldn't find it so for anyone interested heres how I changed my pads on a 2003 Doblo.
1. Take wheel off...
2. You should be looking at the brake caliper mount and disc.
3. Locate the 2 allen keys holding the brake caliper (rear of) to the caliper mount. Remove the rubber caps and remove allen keys.
4. Tap the caliper and wiggle it about as it will probably be crudded into place then slide it off.
5. remove the large metal pad clip.
6. Remove the pads (they will need tapping about as also probably crudded into place).
7. Using a small bench clamp and a piece of wood, screw the piston back into its housing (keep an eye on fluid squirting out of the brake reservoir and protect with a cloth).
8. Sparingly use grease in appropriate places to stop the unit from re crudding itself and put the new pads in place and reassemble the caliper unit.
9. Put wheel back on and test brakes.
Now could someone do a similar write up on the rear brakes.

For the benefit of the non-mechanically minded, I've just had my local ATS Euromaster change the front brake pads on my 2008 1.4 Petrol Doblo Dynamic for £64 including parts & VAT. Very professional, no appointment needed and they did the work while-I-waited.