You should judge every Bible version against the KJV - King James Version
and then get a copy of the New King James Version - NKJV - you will have to suffer the atrocious Americanised spelling,
but I believe one can buy a NKJV with British spelling.
These two Bibles ought to be sufficient for your reading. When you get stuck on passages in the KJV just use the NKJV to
get the gist of the scripture in more contemporary English.
Browse second-hand bookshops and welfare shops for a good dictionary printed before 1960 as these older dictionaries
have more substantial word definitions than modern contemporary dictionaries.
Also older dictionaries when listing words pertinent to Christian doctrine such as saviour, repentance, baptism, faith,
and such will give good theological meanings for these, even referring to Jesus as the Saviour for example.
One beautiful old 1930s "Home Dictionary" that I bought for $4 even has scripture references in the word meanings
when it comes to Biblical and Christian word entries.
Older dictionaries will have meanings for Thy and Thou and Ye and other KJV words (archaic).
Nick