Hi Jo - Great topic. I currently use around a dozen different software solutions for various clients I manage as a HSEQ Consultant and have reviewed most of them for clients wishing to go that way. Have to say there is certainly some good and bad out there. I'd recommend an integrated HSEQ option that is a well established product in the market.
Happy to share my thoughts on what I believe is a market leader as well as scalable very affordable for small to large businesses.
As a consulting business we have landed on one solution that provides the best functionality we have come across so would only recommend that for our clients going forward. More than happy to discuss my experiences with you.