who's pottery mark is a rampant lion holding a staff. Materials are milk glass or white pocelain?

Answer 1

It could be: Samuel Barker & Sons.
It's difficult to tell from a description.. perhaps you can recognize your mark here. I hope this helps!
http://www.oldandsold.com/pottery/greatbritain29.shtml

Answer 2

There are pottery trade-marks and makers-marks catalogues available, if you can't get access to them yourself, ask at a place that deals in antiques. Take the items for them to look at, and you will probably have the answer in short order.

Answer 3

Possibly Royal Doulton.I know they have a lion but not sure about the staff