I have replaced on my doblo cargo 1.3 multijet 06 plate the front tyres, break discs and pads and had the wheel alignment done at my local garage.

For some reason after replacing all the above and getting my wheel alignment done my steering feels v light. Is this something i should be worried about?

I have also been told it could be down to over inflation on the tyres.

My tyres are 185/65R15 i have 36psi in each tyre.

Any info would be great

Tyres I should think.

I have just had some cheap budget tyres fitted to the front and they seem grippy, and much quieter than the old ones. And a bit ighter too. Perhaps the old ones were a bit down on air.

And I know, new tyres to the back, but the backs are very new...

Suppose your right, its most likely a combination of new pads, break discs and new tyres, also i changed the oil, air and fuel filter on the same day.

The only thing the garage did was new tyres for me and wheel alignment.

sorry forgot to ask what is the correct psi for my 06 plate 1.3 mutlijet cargo with tyre size 185/65R15

If your tracking was out much (towing in/towing out) it would be loading the steering up too & making it feel heavier.Plus your old tyres may have been low on air.So could of been both.
I put 38psi in my 06 Doblo Cargo 1.9 Multijet.