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#Post#: 130099--------------------------------------------------
Surrey – 57mph in 50 – LTI 20:20 calibration certificate
question
DIR By: xenu
Date: September 10, 2026, 10:13 am
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Hi,
I have received a NIP alleging 57mph in a 50mph limit.
The device was an LTI 20:20 UltraLyte 1000. The calibration
certificate was valid on the date of the alleged offence.
Section 10.4.2.2 of the Home Office Speedmeter Handbook appears
to say that the certificate should show the pulse
repetition/clock frequency against its expected value and the
actual versus measured ranges.
The certificate supplied to me instead gives “Pulse Repetition
Check (Hz): Pass” and lists the distance tests simply as “Pass”,
without showing the numerical measured values.
I'm not claiming this proves the device was incorrectly
calibrated. I'm trying to understand:
Does this omission have any legal significance, or is it merely
an administrative/documentation issue?
Is it worth asking the police for the complete
certificate/continuation sheets and underlying calibration
results before deciding how to deal with the allegation?
If the numerical measurements exist in the calibrator's records
but don't appear on the certificate itself, does that satisfy
the Home Office requirement?
Thanks.
#Post#: 130100--------------------------------------------------
Re: Surrey – 57mph in 50 – LTI 20:20 calibration certificate
question
DIR By: andy_foster
Date: September 10, 2026, 10:38 am
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No, yes.
No
Who cares?
#Post#: 130105--------------------------------------------------
Re: Surrey – 57mph in 50 – LTI 20:20 calibration certificate
question
DIR By: NewJudge
Date: September 10, 2026, 11:12 am
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The device (provided it is "type approved" and with or without a
calibration certificate, regardless of what such a certificate
shows) is assumed to be reliable unless the contrary is shown.
The burden to show it cannot be relied upon rests with the
driver. Deficiencies in the calibration certificate, or even the
absolute lack of one, may help in that task but, by itself, it
is unlikely to convince a court that the device is unreliable.
--- Quote ---
> Is it worth asking the police for the complete
certificate/continuation sheets and underlying calibration
results before deciding how to deal with the allegation?
--- End Quote ---
You can ask for whatever you like but the only way to deal with
the allegation immediately is to respond to the accompanying
“request for driver’s details.” The police will then decide what
to do. The most likely outcome is the driver will be offered a
course for that speed (provided he or she is eligible). Failing
that, a fixed penalty (£100 and 3 points) will be offered.
Taking advantage of either of those will require accepting the
allegation as it stands. If the driver wants to get involved
with technical defences, the police will almost certainly say
the only way to do that (and so get to see the evidence they
intend to rely on to secure a conviction) will be to decline any
out-of-court solution and instead have the matter heard in
court.
#Post#: 130115--------------------------------------------------
Re: Surrey – 57mph in 50 – LTI 20:20 calibration certificate
question
DIR By: FuzzyDuck
Date: September 10, 2026, 1:40 pm
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Be aware, if the police think you are on a "fishing trip", they
may not offer to a course or fixed penalty and go straight to
court action.
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