If you plan to use an agenda, be sure to forward it to your British colleagues in sufficient time for them to review it and recommend any changes.
Punctuality is important in business situations. In most cases, the people you are meeting will be on time. Scots are extremely punctual. Call if you will be even 5 minutes later than agreed. Having said that, punctuality is often a matter of personal style and emergencies do arise. If you are kept waiting a few minutes, do not make an issue of it. Likewise, if you know that you will be late it is a good idea to telephone and offer your apologies