Hong Kong → United Kingdom
Hong Kong plugs
Type GUnited Kingdom plugs
Type GShared plug type: G
Compatibility: Compatible
Voltage — Hong Kong 220V — United Kingdom 230V
Voltage difference is small. Most electronics will work safely.
Device compatibility (phones)
Phones almost always support 100–240V, so yours should work safely. Check your charger label to confirm.
You likely only need a plug adapter (if socket shapes differ). Voltage is close between these countries.