This operation is contained almost entirely with the London City Control Zone - Class D, therefore visual separation may be applied between aircraft operating under VFR, providing the weather is suitable. 3nm radar separation is only required between aircraft operating under IFR or SVFR. Traffic information on conflicting VFR flights may be given to IFR flights, but separation is only applied if requested by the pilot of the IFR flight. If the airship is following H4, then we can use right side separation, or geographical separation, using the River Thames.