P45 vs Starter Checklist

Hi, I began working for an agency a month ago. When i started at the agency i filled out a Starter Checklist form as i didn't have my P45 to hand. I finally received my P45 from my previous employer a few days ago. The firm i'm currently working for through the agency have said they'll give me a contract in 2 months time. Is it still best to give the agency my P45 now even though i'll be leaving them in 2 months time, or should i hold onto it and give it to the firm when i eventually get set on in 2 months time? Thanks.

Hi
If you have the p45 you should pass this on now.
Thankyou.
Regards.