一か月半可能

名古屋のかたですね。
www.heathrowairport.com

Home Heathrow Airport guide Services and facilities Left baggage

Left baggage at Heathrow

There are left luggage/baggage storage facilities in each terminal at Heathrow Airport. Baggage and luggage items can be stored for a few hours or up to 90 days.
All items are subject to security checks, including X-ray screening and random hand searches.
Left Luggage services are operated by the Excess Baggage Company.

Charges
27+18かな？

Terminal 3
Arrivals level (ground floor).
Opening hours: 05.30 - 23:00.