Absolutely! A visit to the historical and cosmopolitan cities of London, Canterbury, Ely, and Durham is a great idea. Here are some travel tips for your trip:

Best Time to Visit:
The best time to visit these cities is between March and June or between September and November. These periods offer the most moderate weather and fewer crowds.

Route and Accessibility:
A direct flight to London will bring you to the heart of the UK. Once you're there, England's efficient train and bus services make it easy to get to Canterbury, Ely, and Durham.

Altitude and Acclimatization:
These cities are located at a relatively low altitude, so acclimatization is not a concern for most travelers. Still, always take care to rest after long flights to adapt to the new environment.

Accommodation and Booking:
London and other cities offer a range of accommodation options to suit all budgets, from luxury hotels to hostels. It's always wise to book in advance to ensure availability, especially during peak tourist season.

Clothing and Essentials:
Pack for temperate weather — a waterproof jacket may come in handy as rain is common. Comfortable clothing and footwear are advisable as you may do a lot of walking while sightseeing. Don't forget a universal power adaptor for your electronics.

Health and Safety:
UK cities are generally safe, but as with any travel, it's essential to stay aware of your surroundings, especially in crowded areas. Health services in the UK are excellent, but it's always a good idea to travel with insurance for peace of mind.

Local Etiquette and Respect:
Politeness is highly valued in the UK. Ensure you queue patiently, respect personal space, and remember to say please and thank you. When visiting churches or cathedrals, like Ely and Durham, avoid wearing overly casual or revealing clothing out of respect.

Enjoy your trip!