The registers for St Bridget's church are held at Liverpool Record Office, they are not online for the time you want.
Do you have Richard's death certificate? I was just thinking that perhaps he was buried with his wife that might lead to when she died.
Yes of course you are correct, I got the marriage record from the search room at Central Library but I needed a reference to get this, can't remember exactly what this was but I can remember needing to give them some information to find the volume they needed.
No I can't find a record of Richard's death either, I think it was within a year or two of May's but I don't have firm information on this.
Thanks very much for your help
Joan