New UK changes from Ofcom
History
Current Software Release: v1.3  ( Friday, 06-Dec-2019 11:06:47 PST ). Current Help Release: v1.0  ( Wednesday, 27-May-2020 07:33:25 PDT )

Timeline

2020-02-21 Ofcom launches a Consultation on EM Field exposure:
"Proposed Measures to Require Compliance with International Guidelines for Limiting Exposure to Electromagnetic Fields".
2020-02-28 RSGB EMF Brief (in reply)
2020-03-11 ICNIRP publishes revised guidelines (with detailed 1998 to 2020 differences) on limiting exposure to electromagnetic fields1.
"Guidelines for limiting exposure to electromagnetic fields (100 kHz to 300 GHz)"
2020-03-24 Ofcom announces all consultation deadlines have been suspended until further notice.
2020-04-07 EMF licence conditions (FAQ clarification) from Ofcom.
2040-05-07 Ofcom re-starts consultations.
2020-05-15 Ofcom consultation would have ended2.
2020-06-12 Ofcom consultation now ends on this date - extended2.
2020-12-31 'Earliest' adoptation of changes to Wireless Telegraphy Act by Ofcom.


Calculation: An existing calculator for 1998 guidelines is available, ICNIRPcalc (v1.5 ) from Thilo Kootz, DL9KCE. It is available from IARU Region 1 site (caution, link to zip file).
A version taking into account the changes for ICNIRP 2020 guidelines [Say, ICNIRPcalc2020 (v-.- )] is not available for download and any proposed update is NOT coming at this time.
I have been in touch with Thilo and his answer is:
I am aware of the fact that ICNIRP has been changed. In the EU, we have had a Recommendation to all members states since 1999. This Recommendation still holds and is transferred to national law in most of the EU states. ICNIRPcalc is based on those limits and until the EU changes their recommendation, most of the member states will not either.

Notes:
1. Ofcom’s consultation was published before this date and therefore refers to the previous guidelines, dated April 1998.
Ofcom noted in their consultation that they would reflect the updated guidelines in their future work.
ICNIRP - International Commission on Non-Ionizing Radiation Protection.
2. Due to 'coronavirus'/COVID-19/SARS-CoV-2, the Ofcom consultation was indefintely paused. However, it was resumed with a new end-date.