Harry Monk:
Yes, you should register with at least two agencies and you should let them both know that they are not the only agency you have signed up with. This will keep them on their toes.
That’s my thinking. I keep them on their toes 
.
Thankfully I am not the loyal type. I will switch agencies/employers at the drop of the hat if it is in my interest. Not the type to wait around the phone all day expecting a job.
carlston49:
You can split your income tax free allowance between employers.A quick phone call to HMRC is all you need to do.
Google “Contact HMRC” for all the phone numbers to the various departments.
Income Tax: general enquiries
gov.uk/government/organisat … -employees
Thanks for the tip.