Upvote:6
The Canadian TSA website says that you can indeed pack disposable razors and cartridges in your carry-on:
Disposable (safety) razors and blade cartridges
- Carry On Baggage: Yes
- Checked Baggage: Yes
Whereas the website of the European TSA-equivalent organisation mentions razors (without mentioning disposable or not) and the fact that they are prohibited in carry-on luggage:
LIST OF PROHIBITED ARTICLES IN YOUR CABIN BAGGAGE:
[...]
c. objects with a sharp point or sharp edge (objects with a sharp point or sharp edge capable of being used to cause serious injury), including:
- [...]
- razor blades,
For future reference, here is the list of prohibited items on flights originatin within the EU.
As @chx correctly points out, UK is also in Europe. According to the governmental authorities, disposable razors are allowed in both carry-ons and hold luggage: