The SNP will see it never gets passed.
Here are some numbers for you.
There are 650 MPs. However Sinn Fein do not recognise Westminster so do not vote. This means to get a majority you effectively need 322 votes (326 - 4 Sinn Fein)
The SNP have 56 MPs.
Tell me HOW the SNP can block a majority in the HoC? I'd like to know, how you have come to this logic about them 'seeing it never gets passed'.
If Scotland manages to block Brexit, then it will be because the referendum was flawed in how it dealt with the constitution of this country. Not because the SNP have done something wrong. They can not just block it without having a good reason or out of spite.
It will be a failing of the government - the previous one and the current one.