Migrant communities live in particular areas not because of their wealth or lack of but because of a number of factors such as socio-political factors. Many Mauritians who came to England in the '70s were highly qualified and yet were not allowed to work in the areas they were qualified in and had to take employment in factories before gaining employment in more skilled areas. Many faced a lot of racism, being unable to gain employment is one aspect of racism. That Mauritians succeeded and have created communities in various parts of the UK is a testament to their resilience, resourcefulness and absolute brilliance.
Really 
.I spent 20 years in England and I have yet to discover the so called "Mauritian community". Not sure why you are bringing the 70's era as it was no different to Indian/Pakistani or for any other south Asian community, let alone Mauritian. That era was different with the true hard working Mauritians, but that population is either dead/decimating/or moved back to Mauritius.
Lets compare the current 2nd generation/new arrivals from Mauritius who have just come to the UK or (England) as they like to call it if they are from village rather than city in Mauritius):
Some facts:
1st choice : Canada
2nd Choice : UK
3rd Choice: USA
1. As per the original post majority of Mauritians are poor in UK (asset wise and education wise),despite what you want to believe in your own world and the reason they are concentrated in the above mentioned areas, because these are cheap ghettos and you have a family of 4 squeezed in a 3 bedroom house.
Also you said you are from London, SO you must know the amount of Mauritians in the council estates or housing. They make up nearly 2% of the new arrivals. This is all from the government data.
2. Majority of current Mauritians are working for NHS/Care homes despite what they tell you when they visit Mauritius. You will find very very few Mauritians working in the top paying sector like finance or Investment. Also most of them are in a low paid jobs and being funded by taxpayer in the form of many benefits. Take the subsidy away and you will see how many end up on the scrap pile.
Reality might be hard to accept, but if you have lived in the UK among the Mauritians you will know that the life they portray back home is nothing like what they have here. Poverty is rife among the Mauritians, and there are very few wealthy ones around.
Again the well off ones live around Essex border or up in Surrey so maybe you could use google and take a trip around the areas and you will see what I mean.
You wanted to know where you can learn creole, and based by your name I am assuming you are 2nd Generation Mauritian you will find a teacher in the above areas. Also if you want to learn because you really want to learn croele good for you, however if you are looking to move stick with English as you get better treatment in Mauritius if you speak English, but you must know that.(Another trait of being low skilled and uneducated )Good Luck