These are quite cheap to buy.

The TP-Link TD-W9970 N300 for about £35 or less (£29.99 at Argos). Very good value for money, and readily available locally, so easy to return if you are not happy with it.

 

 

There is a review here http://www.kitz.co.uk/routers/tplink_TD-W9970_review.htm

There is a quick setup wizard.

Login details

Broadband Username   bthomehub@btbroadband.com

Password bt

Even though you are not using a home hub

There is a quick setup wizard which you select the type of service you are using, and the login details. Just follow the prompts.

There is a emulator  on this page which you can try.

http://uk.tp-link.com/resources/simulator/W9970V1_Emulator/index.htm

Start with the "quick setup" page, and you can see what is required to set it up.