Tete a Tete Daffodils & Rose Plant

Hi Guys 2 questions from me.

Last Autumn I planted some Tete a Tete Daffodils and got lovely display early Spring. As Monty Don said I let them die back before lifting and storing in the garage to plant out again this October .
When I lifted them each plant had extra bulbs on them like a shallot would. Do I just separate and re plant the 'new' bulbs? I think the 'new' bulbs has doubled the amount I have to plant. Does this happen each year?

Second question, yesterday I bought a Rose in a pot (Rosa Magic Pink) from the reduced aisle at the Supermarket, it was only £1.50. Most of the foliage looks okay but some of the leaves have began to turn yellow. What causes this and what can I do to help the plant back to full vigour? It does have about 4 buds on which are about to flower.

Thnaks