the downside about visiting this country is the weather. You can plan to visit in the middle of summer or middle of winter and chances are you get a wet and windy 8 deg celsius day. that said London is a microclimate you can almost guarantee it will be nice in summer.

also you are on about visiting the homeland, which part? go there. If you want to visit key parts of England. the tourist areas of London are nice but extremely busy.

Liverpool, Newcastle, York are good places to visit spend a couple days. If you rent a car there are loads of places worth a visit. Droitwich Spa they built a church paying homage to the late western Roman Empire churches built in Ravenna. Pretty cool in person but the real stuff is in Italy. Still a nice thing to see.