Hi Matt
Are you just looking at deaths in Swindon ? There are quite a lot in Minety, isn't that where John Keen and Mary Wayt married ?
claire
EDIT: there are lots of Keens in Minety 
Wayt Keen married in Bristol as WEIGHT KEEN to a Jane Fisher and their childrens records are NC baptisms.
claire
Thanks for that. I think Swindon is the best place to start looking for Thomas or Richard's marriage or burial simply because I know they were christened there but know nothing else about them. They could have moved somewhere else though obviously.
Yes there are a lot of Keens in Minety, which as you say is where John and Mary married. Their son Sylvester was born in Hankerton but I have no idea where the other children where born at the moment.
Thanks for the information about Wayt Keen. I have seen the name spelt Wait, Waite, and even Weyt but I hadn't even thought about Weight as a spelling. I will check Bristol for any other references to the Keen name though.
When were Wayt (or Weight) and Jane married? I cannot find them on Familysearch but haven't checked Ancestry or Findmypast yet. Do you know the names of their children or have the dates they were born/died?
Btw what did you mean when you said that their children's records are 'NC baptisms'?
Many thanks again
Matt