When looking for the best deals on accommodations in London, you can compare prices and amenities offered by different hotels, guesthouses, bed and breakfasts, and other lodgings directly through online platforms such as Booking.com, Expedia, Hotels.com, Airbnb, or by visiting the websites of individual accommodations. Additionally, you can check for discounts, promotions, or special offers available from the accommodations themselves or through loyalty programs and membership benefits you may have.