I mean you pretty much answered your own question. The UK never colonised China to anything even remotely close to the degree they colonised India. Which is also why there’s more than 4 times as many people with Indian heritage in the UK than with Chinese heritage. So there’s absolutely zero reason why there should be as many Chinese restaurants/dishes in the UK as there are Indian restaurants/dishes.

Being politically active is so much more than just voting. So many options to do more. You can write to your representatives or call them. You can donate to NGOs fighting for what you believe in. You can be vocal in your opinion on the internet or towards colleagues, friends and family. You can take part in demonstrations or even organise. And a lot of other options.

The mentality of “I vote, what more can I do” is so defeatist and a huge part of the reason why the political right wing can do what they do.

You don’t want to ban advertising, you want people to have an interest in only making their services known honestly and with the intention of letting people know “this exists” instead of with the intention of getting people to buy something. Because it’s actually good to let people know where they can get services or goods and what kinds of services and goods are available. And the only way to truly get to this point is by abolishing capitalism. As long as capitalism exists, there will always be incentive for people to make advertising more than just letting people know. As long as capitalism exists, you can do stuff like “going after false advertising more rigorously”, “banning certain types of ads” or “restricting how many ads are allowed and where they are allowed”. But that only limits the harm advertising can do, it can never stop it completely.