Thank you all very much for your responses. We have decided to go with Clapham, just feel the commute will be easier since its closer to us.
Shoppingmom, unfortunately you can't register for both, Thomas's doesn't allowed the children to have assessment in more than one of their schools at the same time, you have to choose one for the assessment. We did check and fortunately we still have time
![Smile :)](./images/smilies/icon_e_smile.gif)
... he is also registered for three other schools. Thank you!