While the labels remain the same, there is an undeniable global shift in politics towards the left.
You can continue asserting this is true as much as you like, it doesn't actually make it so. It's about as far from "undeniable" as you can get. There is absolutely not a "global shift in politics towards the left"; there has been a shift away from the stagnant status quo in many developed nations but that's been predominantly towards right wing populist and nationalist movement. More broadly, regions typified by Socialist governments such as those in South and Latin America have seen increasing prominence of centre-right and right-wing governments. Most European nations are currently dominated by right-leaning political parties and those that aren't have growing suport for nationalist/populist ones. Nationalism is on the rise globally, and is far more closely intertwined with right wing politics than it is left.
Can you cite some evidence to support your assertions because, from my position you seem to be arguing black is white.
For instance, modern conservatism (or those that claim themselves to be conservatives) incorporate a lot of left wing thinking their ideas.
This isn't a new thing. Right wing political parties have borrowed ideas from other political ideologies for generations now. It's how they appeal to voters outside their core of wealthy, conservative, homogenous, insular core.
It's not 'utter bollocks' because there is growing evidence to prove the existence of this trend and the global dissatisfaction that it is causing if you look at the current global political landscape.
This is a non sequitur. Whilst it's true that political disenfranchisment with the current order is growing globally, the most obvious beneficiaries of this seem to be, as I've already said, right-wing populist parties and movements. Neo-fascist, Christian Identity, neo-Volkish and other violently xenophobic ethnocentric or ultranationalist movements are also growing in popularity. Political disenfranchisment drives people towards extremism of all kinds, to cast it as a left-wing phenomenon is misguided in the extreme.
I live in a 'Western' nation, and being someone who is originally from South Asia where people lean too much to the right for my liking, I can definitely say that in Australia atleast, there is a worrying shift of politics to the other extreme of the spectrum.
In what way? You've got a Conservative government with a protectionist, nationalist immgration policy characterised by some pretty awful treatment of asylum seekers and migrants. It doesn't surprise me that people are angry with the current administration but you shouldn't confuse revulsion at what are effectively concentration camps for immigrants as leftism.
Australia doesn't really have a dominant centrist party.
Many countries don't. It's pretty normal for the two main parties to be centre-right and centre-right. Truly centrist parties often struggle in appealing to voters because they can't differentiate themselves sufficiently.