What sort of weird (interesting)white rock with lots of small holes is this?

I apologise if I am posting this in the wrong place (also wasn't sure what tags to choose)

This interesting pebble caught my eye the other day when I was wandering around on an Anglesey beach in Wales, UK but I haven't a clue what sort of rock it is and what has caused the little holes in it.

Parts of it are smooth while others are covered in holes (see below)

Any suggestions would be greatly appreciated - I am just really curious :)

enter image description here

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edited Nov 18, 2017 at 19:43

Charlie Brumbaugh

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occurred Apr 13, 2014 at 11:12

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edited Apr 9, 2014 at 15:22

user2766

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edited Apr 9, 2014 at 13:08

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asked Apr 9, 2014 at 10:32

user3127

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What sort of weird (interesting)white rock with lots of small holes is this?

What sort of weird (interesting) rock is this?

What sort of white rock with lots of small holes is this?