A large white and black cat without collar, (haven't been able to get near it enough to sex it or get any more details), extremely friendly and affectionate, and seems to have been a domesticated cat as it has been scrabbling at their catflap (from the previous owners) so seems to know its purpose. 
I arrived this afternoon and it has literally sat outside the back door and not moved since.   
Tod has now gone to Avon Cat Rescue :

A DSH male Tabby cat, Grey Tabby back with White tummy, White legs
Very friendly. Coat and general health excellent.
Found in the area of CAB International , Nosworthy Way...
contact: 01491 832111 email

Found in the Winterbrook area of Wallingford
A Brown and White DSH cat wearing a White Collar
Generally healthy
contact: 07887 623898

Found in the area of Bear Close.
A DSH cat with Yellow eyes
Black and White fairly small with White socks and front.
Now with West Oxon Cats Protection
contact: 01993 831350  email

Found 9.30am at the Pear Tree Roundabout, Oxford
A Ginger and White DSH cat
Sadly the cat was clearly dead but most of us would still want to know. I am reporting it to Oxford City Council Environmental Services and assuming they collect it they will have information.
contact: 01865-270985 email