A theoretical that has come to mine for me:

Say I live in a liberal democrat/SNP marginal and I'm a person who for some reason really really hates the Liberal Democrats. I'm desperate to stop them winning. 

So I register a new political party and run in the next election. This party has a name like the Libel Dems or something similar. 

The intention obviously being not to win but to trick people who would support the party I don't like into accidentally voting for me. 

Are there any laws in place to stop such a situation?

How far do they stretch? - how similar would be too similar? 

Would there be any legal consideration of my true political views in this?

Has this ever been tried?