Hello safrican,
I have a Goodmans breadmaker but not the same model as yours, mine is GHB161A. I have searched my manual for an address for you but without success unfortunately. The company is Goodmans PLC.
The only solution I can suggest is to find somewhere which sells your model and ask them if they have a contact number or address for the company.
To have the manual is pretty important as there is a lot of safety information in it .
There is a website which you can look on for help in locating manuals but I do not remember what the name of it is.It may be worth asking on Ebay if anyone on there has one which they no longer use.The section is called 'I want it'
Sorry I can offer no further advice .
Masterchef