I realise this change touches a lot of areas and ways - this is mainly because of the number of addresses I've adjusted to a standard form. It might possibly be best to add "Saint" to road names as an alt_name for search results, but despite varying practice by Hastings Borough Council (variable on "St"/"St." and the possessive apostrophe, but never "Saint") and the signage (typically "St."), the OS OpenData reflects the proper legal name of these roads to the best of my understanding.