Based on your description, it seems like you are interested in becoming a fire warden and need a valid certificate associated with certified bodies. One of the requirements for this job is to have COSHH (Control of Substances Hazardous to Health) training.

Regarding your first question, whether physical or online training is better for COSHH training, it really depends on your personal preference and learning style. Physical training allows for more hands-on experience and interaction with the instructor, but may not be convenient if the location is far from you. Online training offers more flexibility in terms of when and where you can complete the training, but may not provide the same level of hands-on experience.

As for your second question, when selecting an online training provider, it's important to choose a reputable and reliable one. Look for providers that have a good track record, positive reviews, and are accredited by recognized organizations. It's also a good idea to compare the content and duration of the training offered by different providers to make an informed decision. Some popular and reputable providers of COSHH training include IOSH, NEBOSH, and RoSPA.

Ultimately, whichever option you choose, it's important to make sure that you receive adequate training and certification to be a competent and effective fire warden.