The NCSC offer some excellent advice for all business sizes as well as for families and individuals.
They offer three tools that businesses can use to help secure their environments.
IP address & website scan
This scan checks the security of a selected IP address. It scans for common weaknesses and open services. For example, FTP services or open non common ports.
URL: Check your IP address & website security – NCSC.GOV.UK
This scan checks to see if you have the available security enabled and active on your email services or could be intercepted or forged.
URL: Check your email security – NCSC.GOV.UK
Browser Security Scan
This tool checks to see if your browser is up to date. It can either check the browser you are using, or check another browser via a web link.
URL: Check your web browser security – NCSC.GOV.UK
Give them a try!