1. Having moved to the UK over 15 years ago I can say that both tea and coffee are of good quality now. 25 years ago it would have been hard to find a decent cup of coffee.
2. Satnavs for walking are OK and getting better. Main problems are that they can have trouble detecting where you are (closer to buildings than one is in cars) and they can find it hard to see what direction you are moving in. Aside from that routes can be unknown.
3. As a cyclist I can add that using combinations of Google-maps, OSMand and Navmii have served me very well finding my way as both a pedestrian and a cyclist. The quality of the maps and the hardware has kept improving rapidly. The ability to know where you are and have insight into the environment is awesome. The ability to find alternative routes if a bridge happens to be closed, to find shops that may sell tyre repair kits etc. are fantastic.