Click on the 'Drafts Folder', find the email and click on it. It will show the email in editing mode. Edit if required, then click on the send icon like you normally would. This will send the email as normal.
Thank you for your advice and I will try this next time.
I found I could not do anything with the email; it was greyed out and I could not continue working on it therefore it could not be sent. After 10 minutes of trying just about everything I could think of I decided to rewrite my email and send in usual way, but I will try your advice next time, as I am sure it will happen to me again as I am a very slow worker these days, old age is a bug***