A few years ago I wrote a course for teaching assistants who supported students in (secondary) science lessons. The course was widely attended by colleagues from across our local authority. With the recent bad weather we decided to run a refresher course inhouse for our our own staff, since we have had quite a few new teaching assistants join our school in that time. The materials have also been modified slightly to give them a more generic slant rather than being science specific.
The presentation embedded below shows some of the strategies that teaching assistants can use with students in lessons, and the toolkit is a set of templates that can be used to support these strategies.
Feel free to download the toolkit/presentation and use them in your own establishment (whilst respecting our copyright of course). I hope you find them useful.
Download the Teaching Assistant’s Toolkit (printable version) here
Fiendishlyclever 
What a great wealth of information you have shared. Thank you so much. Also reading your “about you” has increased my excitement; I start a new job in September, moving from an academy to a local SEN secondary and your description of such a position was just as I hope it will be.
This is a great resource and would be useful for both teachers and support staff. I found it whilst looking for information to support a Y10 boy about to go on work experience as a TA in a primary school.