Below is a copy of my email reply that you can copy and paste and send across to whoever sent you the “WE HAVE A PSL” email.
Hi [NAME]
I am glad to hear you take recruitment seriously and I don;t want to interfere with what you have going at moment.
Would you feel it would be a good use of your time to recommend the correct process as to how we would apply for a PSL. Also are there any circumstances where a tier 2 / Ad-hoc recruitment agency would be used in delivery should your PSL be unable to serve [COMPANY NAME].
If so could you keep my details/email for future reference.
[YOUR NAME]