Ask yourself some questions:

Why do I want to move on?
Do I enjoy my line of work?
Why do I want to be in Health and Safety?
Do I want a job which makes good use of my past experience, i.e., fire?
What are my financial expectations?
Have I the qualifications/experience for what I want or else what are the gaps and can I undertake more study to fill the gaps etc?
What are my skills. e.g., trainer, interpersonal, technical, management, IT, communication, presentation, etc?
Do I want instead to take on board some other areas as well, because often nowaways many employers add environmental and/or quality into the job role to save employing more than one person.

If you have a strong background in fire then it would be a good idea to make use of that experience. Insurers (Loss control risk management), Fire Protection companies, companies undertaking a fire risk assessment review of their business, fire related training, etc., are all areas which would make good use of your skills and experience.

It is really about you taking a look at yourself and what you have to offer and then looking at what you want in future and then working out the gaps and then evaluating what is required to fill those gaps, and of course if filling those gaps, if they exist, is then practical for you, etc.

I would suggest there are plenty of options for yourself but you need to make some decisions on what you want but do so taking into account what you already have to offer.

Regards.