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Maybe the mountings are a poor design or maybe the strut top gaiter is missing. They are about £26 each side if you do a search using part numbers, the left side is Citroen part no. 5038J7 and the right side 5038J8 but you should check this using your VIN. Replacement should not be too difficult but DIY could take some time. The book time to do both is under 3 hours so you should be able to get a lower quote at a different garage and it is not a specialised job that requires a Citroen dealer. The coil springs need to be compressed so you would need a pair of spring compressors but before doing this slacken the shock absorber top nut whilst it is still on the car. To get to the mounting top nuts the windscreen scuttle may need to be removed first.

Before doing the strut top bearings, have you checked other parts of the suspension ? Knocking going over small bumps could be the anti roll bar drop links, or other options include the anti roll bar bushes, track rod ends, the steering rack bracket bushes, any ball joints. I had a knocking on a C3 which was the drop link at one side and was an advisory at the MOT. I also had to replace a strut top bearing on it after the front coil springs were replaced but one of the bearings was not fitted correctly - this was a bit noisy until I replaced it but I can not remember if it was a knocking noise. It may help to get the Citroen service box from such as ebay as 3 dvds which you install on a pc. It has all the Citroen procedures and parts diagrams and will also help with the clutch change. From these it looks as if you remove a panel on the lower end of the dash and some soundproofing to access the top of the strut, it may help to slightly slacken the top nut here, raise the van and remove the relevant wheel, use axle stands, undo 4 bolts (190 Nm) clamping the bottom of the strut, undo the 3 bolts (50 Nm) at the top of the strut and then remove it. Then the coil spring will need to be compressed with coil spring compressors so you can remove the top nut (80 Nm), bearing and other bits.