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Afraid I haven't got the same model as you but can give you the number for SIME - 0870 9911114 - give them a call and they will send a copy out to you. That's what I did.
Just moved into new house equipped with a free standing combi boiler - think the model is 400 or 4000??
Having read some of the comments it seems that we are far from alone with our troubles. We too are experiencing the adhoc shut down problem - no pattern it seems to when it happens. But...