Ken,
Assuming the PPL(A) and PPL(H) are separate pieces of paper, you will certainly get two new licences: basically they are sending a covering letter enclosing a new licence with a bit added to the Remarks section. (Interestingly it included some other new bits, too, including removing the national ratings page and including the IMCR on the main ratings page instead; plus it was printed double-sided so I had to cut it down the middle to fit the nasty brown PPL holder.)
Tim