I am terribly sorry you had problem with the Wi-Fi.
The Wi-Fi available in the apartment is BT (British Telecom)
Infinity Broadband Internet.
I was surprised to hear you had problem and contacted (website hidden) did confirm that they had problems on the 2nd, 3rd, and 5th of April, the period of your (website hidden) also confirmed that they had problems on the above dates on the following site:
(website hidden) DOT uk / problems / bt-british-telecom
Sorry again for the inconvenience.
The BT WiFI is known for reliability.