The standards of conduct contained in rule B1 do not apply when you are engaged in cross-border practice. Note that this term does not encompass transactions or activity between the constituent parts of the United Kingdom. When engaged in cross-border practice you must comply with rule C1 instead.
The principles which apply are broadly similar, however, the Code of Conduct which applies to cross-border practice is that adopted by the Council of the Bars and Law Societies of the European Union and is therefore not wholly within the control of the Society. Minor discrepancies are, therefore, inevitable and you should consider the appropriate rule and Code in detail.