Hi Danny,
Pleased you enjoyed you EICR.
As for the big yellow book, you should be able to pick one up really cheap as the new 18th edition is in the pipeline so the 17th will be obsolete soon.
If your working with other sparks who have access to book I wouldn't bother getting one until the new blue book is out unless you really need to.
I'm impressed you got a full EICR done on 7 circuits in just 3 hours. It would take me a full 7-8 hour day to do an EICR without doing any work like replacing sockets and light fittings.
Curious to know how long it takes others to do an EICR.
Pete