How much money can an Indian tourist carry to London. Is there a regulation by the Indian government or Uk Govt.
There is no limit for bringing money into the UK, however amounts of 10000 euro must be declared:
e.g. from the VisitLondon site:
Declaring Your Goods When entering the UK from a non-EU country, you must make a declaration to customs if:
You have 10,000 euros or more (or equivalent) in cash
The amount you can take out of India is covered thoroughly in this question: