DVLA Freepost or need stamp?

[Pug]

Sending my License and V5c back for change of address, have 2 addys:

DVLA
Swansea
SA99 1BN(& A)

Are these freepost or do i need to add a stamp? Anyone know?

 

[Pug]

Needs a stamp IIRC

yeah, cant see freepost anywhere, except my "gutfeeling". Maybe changed it. Not worth the risk either way, stamp it is!