Ok...Update!
This morning it was hard and lumpy, the Arko had absorbed all the excess water, and it didn't take on any of the Pereja Lemon smell either, I guess because the Arko has quite a strong scent and the Pereja is quite weak too.
I decided to stick some Brut in there instead as I thought it might complement it. I ended up putting about 30ml in, along with about 20ml water. I then placed the bowl into a saucepan of hot water and gave it a really good mix.
I had to test the menthol so had a shave with it, but there wasn't as much as i'd liked, so I dissolved some more Menthol Crystals and added it. All in, I've put in about 3-4g. I've not tried the final mix yet, but it had a nice creamy consistency with a green tint to it.
My first shave with it was pleasant, the lather was nice and yoghurty and there was a nice menthol kick at the end, especially on the cold water rinse. It produced lots of lather and I had to transfer to a big bowl to contain it! During the shave, it didn't feel that slick, mainly cushioned. However, the resulting shave was very good indeed. I always aim for BBS and I always get it, even if I suffer irritation (usually do!). I had a small bit of irritation but it went away quickly. My skin didn't feel dry afterwards, it felt like it had a nice coating on from the soap.
My only complaint is that it could smell better, the Arko has overpowered it and it smells a bit like Fairy liquid I guess. However, the last addition of more Brut and Menthol has improved the smell, though i've not shaved with it yet. Wish I had some Peppermint essential oil, bet that would have been nice...
So, total ingredients:
1 Stick 75g Arko
1 Tube 100ml Ingram
Approx 30ml Brut
20ml Water
3-4g Menthol
Will update once I've shaved with it a couple more times!