Thank you for the replies. I did find a link to the value of Delta T that (pre-Covid) was updated every month:
See the file deltat.dat
The latest value they give is for 1st Feb 2020 (69.3752 seconds).
In my lunar phase program I give the result to one minute (just like the BAAH), which is why I was looking for Delta T. It’s nice to be able to compare the predicted and actual values.