Thank you all so much for your suggestions. It certainly gave me a lot to look at and think about. They change so quickly its sometimes hard to get perspective on what is the best toy for the next months. I thought I would let you know what I had decided on, and then once they open their presents give a review on what worked and didn't work (but might work in x months time).
So I first got them both a gloworm. I always liked them as a child, and thought it would be nice for them to have in their cots. Maybe they will give it a hug, see it light up and peacefully go back to sleep, instead of getting me up every single night

(they have some lovely soothers, but those sort of things seem to wake them up more than anything else now they are older)
https://i250.photobucket.com/albums/gg264/ntlia/MOLTO/385-1.jpg
https://www.amazon.es/Gusy-Luz-Orug...e=UTF8&qid=1441176265&sr=8-1&keywords=gusiluz
I got them a ball popper to share. This was before I had the incident of one twin nearly (half) putting a ball from a chicco activity walker in his mouth, so a bit wary of this one, but hoping it will be okay under supervision. They are supposed to be big enough for a baby not to put them in their mouth, but maybe his mouth is on the big size? No idea, but anyway, hoping they enjoy this one.
https://www.fisher-price.com/en_US/brands/babytoys/products/Go-Baby-Go-Poppity-Pop-Musical-Dino
https://www.fisher-price.com/img/product_shots/W1392-go-baby-go-poppity-pop-musical-dino-d-3.jpg
I got them so musical blocks
https://www.amazon.com/Boikido-Wooden-Musical-Blocks-Set/dp/B000Y2MP98
I got them some lift the flap books, card ones. They have a lot of cloth books, that also have flaps, I showed one to them already, and they seem a bit rough on the flaps though they are very interested in them. I have to keep stopping them from breaking them.
https://www.usborne.com/images/covers/eng/max_covers/baby-very-first-playbook-2013.jpg
Now is where things get a bit mad...
I have been looking at action blocks for some time. I was also intrigued by the wall thing Buttercup mentioned. So firstly I got the action blocks
https://www.amazon.com/Fisher-Price-Bright-Beginnings-Stacking-Action/dp/B00006IJE6
I wasn't convinced by the wall, and personally found it a lot of money to get it shipped here for what it seemed to do (not that I'm saying that a toy has to do "much" or have batteries, it just felt something was lacking). In the US there is another version of the wall thing, but had a lot more to it. More like a table. It came with what was called peek a block, and I fell in love with them. A peek a block is like a small activity block, its from Fisher Price, and they often interact with other toys you can by. (Everything below I purchased second hand, as I was really out of budget by now)
I got them both a Gobble and Go pushing hippo. It has two modes, one for pushing, and then as a ride. It eats up the peek a blocks from the floor, so I thought when they are older they can play at seeing who eats up more blocks. I then got a massive pack of peek a block which also includes the alphabet. I want to use these at work (I'm a teacher), so really excited about them, I generally get very excited about teaching material and toys lol.
https://www.pascherici.com/media/Petit%20trotteur%20Hippo%20Peek%20a%20blocks%20Gobble%20et%20Go%20Hippopotame%20-%201.jpg
https://www.amazon.co.uk/Fisher-Price-Peek-Blocks-Gobble-Hippo/dp/B0001J2NKK
https://www.bigw.com.au/p/WCC100000000027875/prdImages/PRIMARY/zoom/0/?context=bWFzdGVyfGltYWdlc3w0MTQ3N3xpbWFnZS9qcGVnfGltYWdlcy9oYTIvaGIwLzkzNzMwODk0NjQzNTAuanBnfDE4MDRjZjZlNzcxNzhjNTYzNjIzYWE4MmE5YTExOTg0NDBkMmEzYmFkOTdlMTUyNjI4NGIwMjhjMzM2OTYwNTY
I then got two more toys to share, that work with the peek a blocks. A train and a push a long elephant.
https://ecx.images-amazon.com/images/I/41kupOpQEFL._SX300_.jpg
https://www.amazon.com/Fisher-Price-69078-Poppity-Elephant/dp/B0000D12WT
https://www.gatewaynmra.org/wp-content/uploads/2005/05/fisher-price-train.jpg
https://www.amazon.com/Fisher-Price-Peek-a-Blocks-Press-Go-Train/dp/B0000D12WU
They also have a lot of toys for 1 to 3 years already because of me buying bundle lots online from ebay. I recommend this as you end up with toys you never knew existed.