Speed Limiter not working & airflow sensor

[kevinofengland]

Hello all. Two things someone may be wise enough to comment on:
The speed limiter has stopped working and I wonder if there are any common issues that I could check.
Also I need a replacement Mass Airflow Sensor and would appreciate advice on how much I should be paying and if there are some better than others[i saw some online for under £40]
Thanks in advance

 

[AMGeed]

Regarding the sensor, don't be tempted by a cheap one (probably a Chinese copy on eBay). Get one from the dealer that you can trust not to fail a few weeks later like the cheap one probably will.