Repeating Appointments not adjusting for GMT to BST time change

Repeating Appointments not adjusting for GMT to BST time change

I have a number of repeating calendar appointments which run for many months, however, they were setup in GMT and have not adjusted for UK BST. So if setup to start at 10am in GMT they are now showing as 11am.

Most calendar systems adjust for daylight savings - why not Zoho? This is surely a common problem - or am I just missing the correct setting?