My mom loves jigsaw puzzles and some of the ones she enjoys are difficult to come by here and expensive to have shipped so thought I would shop for some while in London but have no idea what shops to look in. Suggestions?
And, yes, that was a run-on sentence.

Big department stores: leisure(?) or childrens' sections. John Lewis, Selfridges, Harrods. Toy shops.

I seem to remember bringing back a two-sided jigsaw puzzle of an Egyptian mummy for my daughter that I bought in the British Museum. She enjoyed it very much.

Try http://www.shopsafe.co.uk/toypuzzles.asp
Or google.co.uk

Museum gift shops.

Hamelys in Regent St is a huge toy shop - it has literally thousands of jigsaws.

The British Museum online shop only has three, of which only one looks remotely close to being of grown-up interest:
http://www.britishmuseumshoponline.org/invt/cmcp86010

If Greenwich is in your plans anyway, try Compendia in the covered market there. They also have an online shop to save your luggage space:

http://www.compendia.co.uk/acatalog/...w_Puzzles.html

These people are way out of the centre, but again their online shop might be of interest:
http://www.puzzlesonparade.co.uk/home.html

hamleys on line choice. They have as I said, thousands in the shop itself.

http://tinyurl.com/36l5ok

Thanks! You're all superb human beings!

Almost every charity shop will have jigsaw puzzles costing just a couple of pounds at most. I've bought them for my mother. Knock wood, none of the ones we've bought were missing pieces.
Some of them were still in their original sealed wrapping with the original retail price tags (about 10x what we paid).

I know the OxFam shops, but am pretty ignorant about other charity shops in London?

"OXFAM Shops" is one of those brands like hoover or biro that now means all similar things.

There are loads of charity shops in most high streets - but not in the centre of town.

London Transport Museum in Covent Garden area also has jigsaws of Tube maps and Tube logos i believe

Hi
WH Smiths (newsagents on just about every high street)do a good range of jigsaws at their bigger stores and they are good quality too (some of the cheaper jigsaws can be a bit flimsy). The Smiths ones tend to be the 'chocolate box' English scenes of thatched cottages with roses round the door, that sort of thing.
National Trust shops do some nice ones too.