Welcome to Just Answer. I truly hope that you will be able to benefit from my many years experience both in paediatrics, and as a father! I will aim to provide sensible, common sense help, but I need you to read and agree to the contents of this paragraph.
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A great website is: http://www.schoolzone.co.uk/WEBGUIDE/
specifically for preschoolers:
I still use resources from both of these for my children. My mother in law, who is an infant teacher (special needs focus) also rates this site, and recommended it to me.
You can select according to age range or UK syllabus "key stage". This is fairly universal.
A good site for "learning games" that our local schools recommend is http://www.friv4school.com/ and my kids love it.
I have made assumptions throughout this answer that your toddlers have no developmental problems and that they have access to a laptop or PC with you. If you would like to correct me, or ask me further questions, please do so; I would be delighted to try to help further. If you have been happy with this answer, please rate it highly (you can still ask me follow up questions!)