Hello Colin and Welcome to WikiTree.
Here is a link to the Thomas Goddard profiles on WikiTree, I hope you find Thomas you are looking for.
http://www.wikitree.com/wiki/Special:SearchPerson
To do the search yourself, use the 'Find" menu on the upper right. From that menu select Person Search, then on the new page enter the person you are searching for.
You can also use the Find menu to acces a Surname search, which is also helpful and can be sorted by birth year or name.
You can also use the Relationship Finder if you know the names of the descendants. That is also in the Find menu. To use it you need to know the WikiTree profile you want to compare to your own. The result of that search is the common ancestor.
I hope you will find what you are seeking. Keep coming back to G2G and asking questions.