Need help From UK folks finding UK-only parts

I am looking for small quantities of British Telecom Analog (BTA) left and right hand sockets (receptacle) to connect to some sensors with the corresponding plugs:

http://www.vernier.com/support/sensor-pinouts/

The first two pin-out diagrams depict how the two plugs of opposite handedness are used. I looked in a lot of places including ebay and ebay.uk and farnell. I am just not finding them. I figured I must have used the wrong name when searching. If I try to search American phone jacks in digikey I probably won't go very far compared with keyword RJ11.

A cable looks like this:

http://www.vernier.com/products/accessories/cb-bta/

So for someone in UK, what do you call these plugs and connectors? Where do you buy these connectors? Where to buy them in US?

Big thanks!

Is this the one: http://www.4uconnector.com/online/itemagrid.asp?seriesdesp=1%2E5+BRITISH+PLUG&seriesno=0818&GroupNo=08&groupdesp=Modular+Plug%26Jack&itemnum=185&sample=0&seriesnum=27&

If you are desperate to have them in small quantities, just order the samples. Probably maximum 10 pieces. Just don't abuse the sample service, they'll get pissed soon after that. :D

And another same alternative: http://www.morethanall.com/products/index/btype_id/9/type_id/103/id/1168

Do you need the raw connectors? If not, perhaps a UK to US phone adapter would work:

http://www.google.com/search?q=british+phone+adapter&hl=en&client=safari&rls=en&tbm=shop&source=lnms&ei=VrveTprAEqH30gGBiZyjBw&sa=X&oi=mode_link&ct=mode&cd=6&ved=0CDMQ_AUoBQ&biw=1207&bih=1032#q=british+phone+adapter&hl=en&client=safari&sa=X&rls=en&tbs=p_ord:p&tbm=shop&ei=d7veToGHN6Xv0gHhqfCoBw&ved=0CAsQuw0oAQ&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=cd3845f300cc4430&biw=1207&bih=1032

Thanks guys! FYI, I am looking for jacks not plugs.

Here is one I found:

http://www.morethanall.com/products/index/btype_id/9/type_id/103/id/1167

Strange how the pins are bent towards the jack's opening?! Any regular ones like this?

http://www.vernier.com/products/accessories/btd-elv/