Let’s put it this way.
After particularly grim weather the evening before I made a point of putting up an Ad for Dad’s Garden & Landscaping company. This after delivering a pizza to their door in a howling gale. One that inched open ever so slowly to frame the smiling face a Dad’s very cute daughter handing me a two pound coin.
So to answer your question; are you expected to tip? No it is not expected.
But does it make a difference. Hell yes! It does. Tipping is not expected in the UK in the way it is in other countries. All staff in the UK, must by law, be paid at least the National Minimum Wage…wada…wada….wada