Tailgating penalty without an accident

Yes, you absolutely can be fined for tailgating even if no accident occurred.

Legal position:

Tailgating falls under several potential offences in England and Wales, even where no collision takes place.

1. Driving without due care and attention, contrary to section 3 of the Road Traffic Act 1988. This is the most common charge. It covers driving that falls below the standard expected of a competent and careful driver. Following too closely is a classic example. The penalty on conviction is a fine of up to level 5 on the standard scale (unlimited in the magistrates' court since 2015), 3 to 9 penalty points on your licence, and a possible discretionary disqualification.

2. Dangerous driving, contrary to section 2 of the Road Traffic Act 1988, if the tailgating was particularly aggressive or sustained, or combined with other behaviour such as flashing headlights or sounding the horn. This is an either-way offence carrying up to 2 years' imprisonment on indictment, an unlimited fine, obligatory disqualification for at least 12 months, and an extended retest requirement.

3. A fixed penalty notice may be issued by the police on the spot or by post for careless driving, which carries a 100 pound fixed penalty and 3 penalty points. This is the most common outcome for a one-off tailgating incident observed by police where the circumstances are not especially serious.

Practical points:

The police do not need to wait for an accident to happen. They can act on their own observations, dashcam footage submitted by other road users, or evidence from cameras. Since around 2018, police forces across England and Wales have actively encouraged members of the public to submit dashcam footage of dangerous or careless driving, and many forces now have dedicated online portals for this. Tailgating is one of the behaviours most commonly reported in this way.

Highways England (now National Highways) has also run specific campaigns targeting tailgating, particularly on motorways, reflecting the fact that it is taken seriously as a standalone offence.

So to answer your question directly, no accident is required. The offence is the manner of driving itself, not the consequences.