如果有詐騙案底，但想去英國旅遊，可以去的嗎？係咪跟旅行社去比較好，如果到時唔比入境都易處理?

The best way is to apply a physical visa.

In that case, a Consulate staff can review your criminal record to determine if you are admissible. Generally, if your application, you will not experience too many trouble during immigration.