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Section 1; para 1; sentence 1; "with more armour" may revised as "with better armour"
The armour was thicker and there was more of it, so I think that "more" is OK.
Section 1; para 1; consistency error; In the para maximum speed is mentioned as "18 knots (33 km/h; 21 mph)" and in the infobox it is "17 kn (31 km/h; 20 mph)". The same error with the ranges also, "8,750 nautical miles (16,200 km; 10,070 mi) at a speed of 10 knots (19 km/h; 12 mph)" in prose, and "3,500 nmi (6,500 km; 4,000 mi) at 10 knots (19 km/h; 12 mph)" in infobox.
Section 2; Who is "Hon. Mrs. Algernon Littleton"? Please mention something about her capacity (if available).
My source comments that even he hasn't been able to figure out who she was. My best guess is the wife of some aristocratic byblow.
Section 2.1; para 1; Please mention the namesake of the ship. I think it is for Louis Botha, a South African general and later Prime Minister of SA, and also add the same to infobox.
Good idea for the main body, already in the infobox.
Section 2.1; para 1; "where they arrived two days later", "they"? It is only one ship right? Please revise this.
Section 2.1; para 2; sentence 1; "He donated it to a trust", who is "he"? Because just in prior sentence, Minister of Defence was mentioned. It creates some confusion whether he donated or the owner.
Section 2.1; para 2; "The Board of Control offered the ship to the RN", which "Board of Control"? Please mention.