If that has whetted your appetite then the detailed rules are here: http://www.dft.gov.uk/mca/msn_1781-2.pdf
Everyone who uses the sea needs to understand those and can be prosecuted for ignoring them. The attentive will notice that the above rules only apply when the vessels can see each other - but presumably if you are planning to take your boat out with a risk of fog you are not learning the rules from a website!
Remember: Keep a look out at all times > Use a safe speed > Assess every vessel you see to determine if there could be a collision > Take the necessary action to avoid a collision. Make changes in course early and obvious so others can see what you are doing.
If this is all new to you, or your think you need to brush up then you might want to undertake some training (e.g. from an RYA school) either afloat or in the classroom to help you understand these in real life. If you need to find a local school then the RYA website
will help you - but why not ask one of the RIBnet trade members - they are likely to understand the circumstances you will be operating in.
If you are new to boating you might want to take a look here: Sea Safety - The Complete Guide
and RNLI sea safety advice
for some great information that will help keep you safe.
Finally why not test your understanding over here: colregs :: Wiley Nautical