I have two children at the school (nursery class - starting reception in September; and year 3) and it was our first choice for both of them.
I strongly recommend visiting Swaffield yourself, if at all possible, to get a feel for it - my perspective is that it's a happy, friendly, large, diverse primary school which represents the local area.
My children are making great progress academically, but there is so much more of added value in terms of clubs and activities: my eldest has tried choir, fencing, recorder, chess, Playball, tennis and Bollywood dancing in their 4 years at the school!
The teaching team and staff know the children well and bring out the best in each of them.
Another tip is to come along to the school fair to have a nose around - Saturday 30 June from 12-3pm. You could also have a look at the new website: http://www.swaffield.wandsworth.sch.uk/
I hope that this helps! Feel free to private message with specific questions.