Do you ADSL or VDSL (Infinity) ?

I am guessing the latter.

You can buy third party modems from companies such as Draytek.

I would probably just get a new BT one off ebay if it was me.

Homehub 4?

I think I still have my old one.

It's a white box with bt openreach on the front, it goes in between the wall socket and router I think it's classed as a DSL modem

If you're with BT: call them and they should send you a new Home Hub which combines the modem and router into one handy package.

If not: eBay is your friend. You want to search for the "HG612 modem" - make sure it's a Huawei version.

White box with Openreach front?

Sounds like you may mean the filter.

That's the one about router sized not with bt but think I've found one on eBay

I'd be on to BT. If they won't send you a free one, tell them you're cancelling as the service is unusable. See how quick they sort it out.

I've got sorted I'm connected again! Bought an all singing all dancing asus thing thank god we almost had to talk to each other