Question Author
Gromit
/// 1. A one off. - Well they have caught him so he isn't doing another one. ///
Read the rest of my text, even though they haver caught this one it doesn't mean that there are not others.
/// 2. Lone. - The clue is in the police description, Lone Wolf ///
I refer you to my previous answer.
/// 3. Mentally Ill individual - No. This is pre-meditated. ///
That does not mean that he is not mentally ill.
/// 4. Start of a more serious attack. - Depends if this white man is a muslim convert or a far right nutter. ///
Irrelevant, it could be either, start of an Islamic attack by Muslims of any colour, or even, but much less likely, attacks by far-right extremists.