McDonald's also debuted a Chocolate Shamrock Shake ... the now-customary dollop of whipped cream that goes on every milkshake. Large Shamrock Shakes are pretty big, but it's fair to say that ...

It is also the first time McDonald's has mixed things up with its flavours - which are typically just strawberry, chocolate ... McDonalds milkshake which is £1.99 or £2.19 for a large.

A medium Grimace shake will set you back £2.69 - or £2.99 if you want to upgrade to a large ... McDonalds has mixed things up with its flavours - which are typically just strawberry, chocolate ...