London Info / Irish Sea
I have noticed on a number of occasions that London Info is not accessible in the Holyhead area on the published 124.75 frequency, but that contact can be made on the more northern frequency of 125.47, at least with my ancient radios and at levels up to 5000'.
The other day I was flying right over the place (SW of Holyhead) where on the 1/2 mil map where it is printed "FIS .... 124.75" with no contact (at 3000') . I even asked Dublin if they had an alternate frequency - they didn't. So I tried 125.47 and there it was, loud and clear. I don't think there was anything unusal about the conditions on the day.
Considering that this is a popular route for UK - Ireland GA traffic, should the chart not be changed and neighbouring controllers advised of the alternate frequency? It feels good to be in contact with someone over the sea when Valley are closed.