As of today, 3rd January 2019, the microlight and SafetyCom frequencies have been deprecated in place of channels in the 8.33kHz range.
Make sure you update your radios to reflect the new change which is shown below.
- Microlight - 129.830
- SafetyCom - 135.480
There is also a handy website I have came across which gives the old frequencies and new channels of airfields that have changed, or are due to change, along with the date of transition. It can be found by clicking this link and has a useful search function to help you narrow down the large body of results.
You can also refer to CAP1606 for further details of changes.