For exterior wax, it's hard to pass Soft 99 Fusso and or Mirrorshine. It gives good, long-lasting protection.
Both can be a bit fiddly to apply if you put on too much, but the secret is to apply them very thinly. The Soft 99 UK store has an offer on F7 with a decent shampoo, Qjutsu Creamy Shampoo. The picture shows my car after cleaning with Qjutsu and then applying Mitchell and King 'Seal' as a protection layer.
Mitchell and King Seal is a good alternative as it is an easy on/easy off sealant that can last a couple of months. They have a 35% sale at the moment. Check Obsessive Car Detailer on youtube as he has reviewed some of their products recently.
For the interior, I use Reflect Autocare D-Matte, as its nonreflective. Autoglymn also do some decent products. The ones to avoid are anything by Chemical Guys as they are usually expensive and don't last very long.
It is also worth giving the Blok 51 website a check over or even give them a buzz as they are fairly decent and they are fairly quick with delivery. They are based in Kilrea.
Here is what Soft 99 Mirror Shine looks like on a black car. In a toss-up between it and M&K Seal, Seal probably wins on initial price and ease of use. Although long term, the Soft 99 tin has 200g compared to 500ml in the bottle of Seal.