I am sorry your items were confiscated. TSA regulations only apply to flights/airports in the United States as the TSA does not have jurisdiction outside the US. It is important to check requirements for the airports you will use outside of the US for specifics related to liquids or medicines that are important for you.
Here are the rules at Heathrow airport:
https://www.heathrow.com/at-the-airport/security-and-baggage/hand-baggage-and-liquids
Only limited quantities of liquids may be carried through airport security into the departure lounge. This includes bottled drinks, suntan lotion, fragrances, cosmetics, toiletries and all frozen liquids.
The following restrictions apply to all liquids, creams, gels, pastes and aerosols taken through security control:
Liquids may only be carried in containers holding 100ml or less.
They must be carried separately in a single bag which is:
Transparent and resealable
No larger than 20cm x 20cm (8in x 8in)
Able to close properly with all the items inside.
At security control, place the bag in the tray with your other items.
Liquids in containers over 100ml will not be permitted through security – please pack them in your hold baggage instead.
The following exceptions may be made to the 100ml rule:
Baby food or baby milk: breast milk can be carried in the cabin; when it is stored in a clear, transparent container or bag. Flasks cannot be permitted. The volume of each container / bag should not exceed 2litres. Breast milk should be in a liquid format and not frozen. When travelling without an infant only breast milk can be carried in quantities greater than 100ml, this does not apply to formula milk or other baby juice / food. Please check with your airline as individual hand baggage allowance can vary.
You may also wish to take advantage of our pre-order service for collection after security by calling us on 0800 678 5324 or email us.
Liquid medicines: You are only permitted to carry quantities of liquid medication in excess of your personal liquid allowance where it is needed during the course of your flight. All medication should be accompanied by documentary proof of authenticity, such as a prescription or letter from a medical practitioner confirming that you need them for your journey. Liquid medication that is not required on the flight should be carried as hold luggage. Find out more about travelling with medicines.
Explosive or flammable liquids, and those that are considered toxic, are not permitted in either hand or hold luggage.