Has anyone ever contacted their MP for Immigration help?

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Just wondering if anyone here know of anyone who or has had themselves good experiences with their MP in Immigration help?

Its been over 3 months now since my Fiancée applied for her Fiancée visa and over 4 weeks since her interview.
So I contacted my MP, who was great. He asked me for a copy of my Fiancées Fiancée Visa application form, which I sent to him. Within a day he said he had passed my documents onto the home office and asked that they investigate the application . He said he will contact me as soon as he hears back from them. He said it can take a while as papers have to be requested from the embassy.

Do you think this is a good thing? Could this help to speed up or slow down everything? What do you think he means "request the papers from the Embassy?"

Does anyone know of anyone who have contacted their MP and its helped to speed things up or has had a positive effect in someway?