A 69-year-old man with a history of stable COPD (FEV1 60% predicted) presents with a 2-day history of increased breathlessness, increased sputum volume, and sputum purulence. He is afebrile and his oxygen saturation is 93% on air. He normally uses a salbutamol inhaler and a combination ICS/LABA inhaler. According to NICE NG115 (COPD in over 16s), what is the most appropriate management for this exacerbation in the community?