What cultural faux pas should I try to avoid making in Cardiff?

"It is important to be mindful of local customs and etiquette when visiting Cardiff. It is considered impolite to be late for social engagements, so it is important to arrive on time. It is also important to dress appropriately for the occasion, as Cardiff is a fairly conservative city. It is also important to be respectful of the Welsh language, as many locals are bilingual and may be offended if you do not make an effort to learn some basic phrases. Additionally, it is important to be aware of the local drinking culture, as public intoxication is frowned upon. Finally, it is important to be respectful of local religious beliefs and customs, as Cardiff is a diverse city with many different faiths," said another expat in Cardiff, England.