Hi Valerie
There is no record of a baptism for a Samuel Harris at the Anglican Church at Thorpe le Soken that I could find for the year you give, I searched 5 years either side of this date and lots of Harris's but no Samuel.
The only Harris baptism that is around that year is for a Mary Harris, daughter of Robert & Elizabeth Harris, Robert's occupation is a Labourer, the baptism took place in 1819.
I checked for marriages of a Samuel Harris as well but no luck there either. There is a Baptist Church at Thorpe le Soken so it is possible your Samuel was baptised there.
I will keep a look out for Samuel and if I find anything I will let you know as I'm also researching the Harris family from Thorpe le Soken
Jean