Thank you michael m
I was looking for something else, saw this, and thought - I'm going to change that straight away.

Thanks, that is what I needed. I think I have it working in spite of Googles automatically generated js being wrong.
Anyone else struggling with this, I suggest speaking to google adword technical support. They were surprisingly helpful!

I have replaced the banner manager (from 1.1.7), but the same problem persists.
I've cleared the cache. I've tried creating a new block. Are there files relating to the block properties I can look at?
The only anomoly I can find in the setup is on the banner block properties page. I selected the banner group - all fine. The box underneath shows selected banners - selected items 3. If I click Add/Edit button I get error-
Fatal error: Class 'AJson' not found in /home/figtreeb/public_html/extensions/banner_manager/admin/controller/responses/listing_grid/banner_manager.php on line 299

What does it all mean? I used to be a carpenter you know. It was a simple life.

Also thought I should point out I am using default template rather than html_5

I've had look at the demos and my set up appears to be the same.
I have three banner images in a group in banner manager.
In Main Page Banner Slider block properties I have selected the group.
I have enabled the block in the layout.

But instead of three images sliding across one at a time, it shows all three at the same time and is static.
I am using 1.1.6

Sorry to post another question so soon.
I have installed banners with banner manager. I have added them to Main Page Banner Slider Block. I have added the block in Layout.
It just displays the images one above the other. Surely it is supposed to slide? As in a slideshow. or am I missing something?

Thanks Junkyard. I looked at the language definition, but as you say that applies to all RM delivery methods. Really I need separate times for different delivery methods. So the customer can choose to pay more for a quicker delivery. Its not critical of course, but next time a developer is looking at this extension they should include this feature.

Royal Mail shipping extension has an option to display delivery times. When checked it displays alongside the check box for that shipping method in checkout the text "Estimated time". There is no form to enter data on actual time (i.e 3-5 days)

Can someone point me to the file and method to put that text in?
Ive looked at
/extensions/default_royal_mail/storefront/model/extension/default_royal_mail.php and for second class post in line 180 it is calling for 'text_eta' but there is no reference to a value for this variable

if ($this->config->get('default_royal_mail_display_time')) {
                  $title .= ' (' . $this->language->get('text_eta') . ')';
               }               
      

I dont know where to look next.

I still cant get the new text accepted by editing the xml. Cleared all the caches and browser cache and no changes.
But solved the problem using the global search. I hadnt realised what a powerful tool it was for editing attributes. Nice job.