Minor things that really piss you off !

[Incognito]

Invented words bearing the prefix "pre" - like Pre-order, Pre-warn, Pre-book. In every case the "pre" is redundant and the product of feebleness.

Disagree, you can see where pre-warn has developed in the English language from the latin praemoneo. The correct usage may be forewarn, but you can see it's quite a distinct definition from warn. It's referring to a warning before the incident.

Example:
I wouldn't go near that cliff it's liable to collapse (forewarn)
Watch out, that cliff is collapsing (warn)

[Peoplesoft bloke]

Disagree, you can see where pre-warn has developed in the English language from the latin praemoneo. The correct usage may be forewarn, but you can see it's quite a distinct definition from warn. It's referring to a warning before the incident.

Example:
I wouldn't go near that cliff it's liable to collapse (forewarn)
Watch out, that cliff is collapsing (warn)

I agree except that in the first example above, you could perfectly adequately issue a warning - it doesn't have to be a "pre-warning". In fact in either case, a warning is fine.

[Incognito]

Cyclists who ... overtake on the inside

Cyclists and motorcyclists are allowed to 'filter' in slow moving traffic, i.e. overtake on the inside.

ss. 88 and 151 of the highway code

Rules for motorcyclists (83-88) : Directgov - Travel and transport
General advice (144-158) : Directgov - Travel and transport

If you happen to crunch one of them when they are doing so, chances are they'll be successful in suing you for any injury caused for your failure to observe the road prior to your manoeuvre.

[Incognito]

I agree except that in the first example above, you could perfectly adequately issue a warning - it doesn't have to be a "pre-warning". In fact in either case, a warning is fine.

My example was trying to show you shouting at someone as the cliff he's standing on is collapsing, hence the warning as the incident occurs.

It's all semantics though and I would agree the correct usage is forewarn rather than prewarn.