No informal representations with respect to non-compliance with the Nuclear Non-Proliferation Treaty (NPT) have been made directly to the UK by another state party to the treaty. We are also unaware of any indirect statements to this effect. As stated in the 2006 White Paper ‘The future of the United Kingdom's nuclear deterrence’ and accompanying fact sheets: renewing the current Trident system is fully consistent with the NPT and with all our international obligations.
We have no record of any recent informal representations by any states on UK compliance with the Nuclear Non-Proliferation Treaty. The Treaty entered into force in 1970. A thorough search of all historical records since then would incur disproportionate cost.