Kensington Pottery of Burslem, Vases

I have a set of 3 Price Kensington Vases.  They are cream with red flowers and black fern and shiny red inside.  The pattern number is 2571 and REX is impressed underneath.  Does anyone know what the pattern is called or anything about them please.  I can't find anything like them.  The set is a window vase and a matching pair of vases.
The mark is the early staffordshire knot style.

Thanks

I would help to have photos of the vases and the mark.
Meanwhile, there is this:
http://thepotteries.org/allpotters/831a.htm

Price Kensington Pottery is particularly well known for their cottage ware, ie, tea services in the shape of cottages.

It is important to see the mark but I think from what you have said and the style of the vases that they were made by the Kensington Pottery before it amalgamated with Price Bros. at the end of 1961.

The style perhaps dates back to the 1930s but the colour suggests that they are from the 1950s (after 1953) and I suspect that Rex (if impressed is likely to be the shape name) and if an ink stamp then the pattern name.

The knot mark is the early mark. Depending on what it looks like it's either pre or post 1937 which is why a photo of the mark is important.
http://thepotteries.org/allpotters/626.htm

This is the mark.

Thanks
https://i.servimg.com/u/f55/18/58/95/88/mark10.jpg

Looks like the post -1937 mark. I'd go with Studio Pot's comment about them being from the 1950s and pre-1961.

So it is Kensington Pottery of Burslem and not Price Kensington and Rex is the shape. The number is likely to be the pattern number.