Your IHS payment gives you NHS access, but registering with a GP takes time, dental care is hard to get and expensive, and prescriptions in England carry a per-item charge. Sort out what you can before you leave.
In original labelled packaging, with a doctor's letter and the generic names listed. Carry them in your cabin bag.
Paracetamol, antihistamine (cetirizine), ORS / Jeevan Jal, antacid, antiseptic cream, plasters, thermometer, pain balm. Do not carry prescription-only drugs without the prescription.
Eye tests and glasses cost real money in the UK; a spare pair is almost free in Nepal.
NHS dentists are severely oversubscribed and private dental work is very expensive. Fix everything now.
Blood group, allergies, past surgeries, ongoing conditions — written down and carried.
Toothpaste, brush, soap, shampoo, deodorant, moisturiser. Buy the rest there — they are cheap and heavy.
UK winter with indoor heating is far drier on skin than Nepal.
Razors and scissors in checked baggage.
Small quantities; familiar remedies are comforting when you are ill and far from home.
UK winter daylight is genuinely limited, and this is the one supplement UK health services routinely recommend.
Cheap in Nepal, surprisingly useful in an under-heated student room.