We'll be travelling from Reading, friends from Manchester so looking for somewhere half way ish to meet for day. There'll be 2 4yr olds and 1 11month old. Maybe a good park with playground or farm or great childfriendly pub with garden?
Hatton Country World used to be lovely - I know it went downhill for a while but I think it has been refurbished recently (ine are older now so don't go there but have friends who do!). It is a few miles from Warwick.
Or Stratford Armouries has a soft play and does reasonable food.
Just down the road from there is Mary Arden's house - One of the Shakespeare properties and in my village. The house is worth a look around and the grounds are good with an old working farm and lots of animals, falconry displays and lovely walks through the meadows.
Another vote for Hatton Country World. There is enough to do there to keep even the most exuberant child happy, lots of animals to coo over, walks to do, games to play and small child friendly rides to go on.
It is quite expensive, might be worth googling for vouchers.
If you want a park, St Nicholas Park in Warwick is quite nice, you can take a walk along the river and feed the ducks as well. There is also a playground, but it can get very busy. If the weather is good, it has a paddling area for children.
I also immediately thought of Hatton. We went a couple of weeks ago and my 4 year old and 15 month old loved it.
Stratford upon Avon can be a nice day - especially if you get decent weather. DD loves the butterfly farm and doing brass rubbings at the church. Picnic/fish & chips by the river or there are plenty of pubs and cafes if the weather isn't great.
A few miles from Hatton Park is Kenilworth Castle (English Heritage). The best bit is the walk via Abbey Fields/Park/Common to the childrens' playground/feed the ducks which is all free. There are also a number of good pubs within 10 mins walk away. This will be far cheaper than Hatton Park which personally I didn't rate.
I was also going to say Kenilworth, lots to do there. NT properties at Baddesley Clinton and Packworth have lovely gardens, tea rooms etc Not a partic appealing city, but Coventry is easy to reach and has very large memorial park with a great playground (and a transport museum for the younger ones if weather gives out)