Roses which will flower again through late summer and autumn should be dead headed as flowers fade, to encourage development of new buds. That routine is simple enough. Roses which only flower once need different treatment. Our general tendency is to forget about these until late winter or early spring and then to tackle the mess. A much better course is to deal with rambling roses now.
These will flower next year on growth which is made this year, and to encourage new growth now, old flowered stems can be cut away. Wood which seems tired and lacking in vigour can be removed, leaving newer stems for training or tying in. Where there is very little new growth, a sensible approach will be required - do not strip the plant of all its stems.
Dealing with once flowering roses will he much easier now when you will readily distinguish between new and older growth and so can be more certain of your actions than on a bleak February or March day when the leafless stems of the roses will present a much greater puzzle.