I mean that if you make the notification under the act, and your neighbor consents, then you dont legally need a party wall award. Did you serve a notice or just move straight to appointing surveyors? In most cases, the neighbor consents to the notification and thats the end of it.
If your neighbor does not consent, you are required by civil law to get a partywall award. However, this only concerns work that is notifiable under the party wall act. Your builder can lawfully get on when many aspects of the extension / build you are doingjust not foundation work or cutting into the partywall (broad generalization).
If you were to start work that is notifiable under the party wall act without your neighbor consenting or without an award, you would be in breach of civil law (rather than criminal). They could therefore take you to court and sue you but they would have to prove they have suffered damages to be given a cash settlement.
If you werent aware that as a first step, you can simply serve a notice, perhaps, go to your neighbor and explain. It will probably give them a lot of comfort to understand that the surveyor isnt responsible for the safety of the build and if you bring over proof that building control and planning have already approved your engineering drawings / plans, most reasonable people are happy with that. You can then agree between yourselves hours of work / access etc.
Getting a surveyor involved is really designed to get involved when two neighbors cant agree about how to deal with their shared wall. Its really designed as a neutral form of arbitration. The main thing of value the Party Wall award does is the condition report as your neighbor cant claim that pre-existing issues were caused by your work and equally they have a totally irrefutable basis on which to sue you for damages should your builder damage their property. However, if you can agree to take lots of detailed pictures before the work starts and your builder has insurance (which they should) then I wouldnt get a Party Wall Award just for that.