We aren't allowed carry packages?
Yes, but technically, you can only use the bus lanes when you're transporting people. If it's a package/envelope, you can't!
Edit:
NTA Taxi Bible (Ed. 7.1, 2018 version)Use of bus lanes by taxis- The Road Traffic Regulations 1997 permit taxis in the course of business to use normal (with-flow) bus lanes.
- A taxi can use a normal (with-flow) bus lane only while it is operating as an SPSV – carrying apassenger, on the way to pick up a pre-booked customer, or plying for hire.
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Taxis must not use bus lanes if they are not operating as an SPSV – for example, driving home at the end of a shift, travelling on personal business, or transporting only goods and not passengers.- Taxis are not allowed to use contra-flow bus lanes (in which traffic travels in the opposite direction to the traffic beside it) under any circumstances.
- Hackneys and limousines are not permitted to use bus lanes.