Still a little confused lo!!

From experience when you go to the DVLA, they take the logo book off you, and give you a new mot and tax disc there and then on surrender of the old ones, but send the V5 off to be returned to you at a later date.

If he does this there will be no V5 until it returns to him? and the dval wont let him keep the green slip to give to me as they would I guess want the whole thing?

If he lets me take the car before doing this, he wont have the mot and tax disc to give them as I will have them? and guess the dvla wont issue new ones without getting the old ones back?

My brain hurts??