Two suppliers are part of the Accelerated Access Collaborative Rapid Uptake (RUP) Programme and supported by the AHSN Network;
Bedfont - NObreath 
https://www.nobreath.co.uk/resources/
To view how NObreath works, you can watch this short video.
Link to Bedfont website is FeNOTesting for Asthma Diagnosis with Bedfont® NObreath® Monitor
Bedfont's FeNO reading interpretation chart can be found here
For more information contact Marc McDonnell - Intermedical Sales Manager UK & Ireland
marc.mcdonnell@intermedical.co.uk
Circassia - NIOX VERO 
https://www.niox.com/en-gb/professional-resources
Link to access instruction videos of NIOX VERO.
Click here for further product information around NIOX VERO.
For more information contact Steven Adair - Business Manager, UK steven.adair@niox.com
These products are referenced in more detail in NICE Diagnostic Guidance 12 (DG12); Measuring fractional exhaled nitric oxide concentration in asthma: NIOX MINO, NIOX VERO and NObreath.
Here you can review a comparison between the two products. This is a short objective comparison of these two devices, created by Wessex AHSN.