Leon, I have done this trip many times, but not in a small boat such as yours - they have all been in 37 foot or larger catamarans.
To make your journey easier and more interesting, look at Cape Town to Luderitz to Walvis Bay to St Helena. Then sail past Ascension, leaving the island to starboard or stopping if you really need to, then head towards the African coast just east of the Cape Verde Islands. Doing this you will be hard on the wind and should be able to make Mindalo on Sao Vincente. It is a good stop and you will be able to get fresh water, fuel and provisions. From Mindalo you head towards the Azores, keeping hard on the wind for the first week or so when the wind directions change slowly to permit you to aim more directly for the Azores. From there it can still be a crap-shoot to the English coast, depending what fronts are sweeping over the N Atlantic. If you want more info, I can go into more detail but will be away for the next week or two. John.
The Delivery Guy - Now retired after sailing over 400,000 nm