Thanks for the advice SQLRNNR, I have checked the Execution Plans and it appears that the first method using the view generates an extra Hash Table when joining the View to the first table... which I have just noticed is actually an Inline Table Valued Function which uses a parameter to return only entries with a specific ID.

If I take this out and just specify the table referenced directly and apply parameter as a WHERE condition directly it runs quickly even when referencing the view as well...

Again, I though the Inline Table Valued Functions would still operate as a View does OR is that not the case?