John Lewis is a good place - loads of books of wallpapers and they also have rolls on display. I'm not sure about the Trafford store as I usually go to the Cheadle one. If there's a sample you need of something that's not in store, they order in for you. I also go to Laura Ashley, same again if they don't have a particular one in store they order a sample and its posted to you. I've found Wallpaperdirect pretty good too. I do know a few who swear by Wilco for decorating supplies but I don't have one near to us.

I have spent hours searching for this wallpaper with no luck what so ever. I can't even find a close match. I need lots of help! Does anyone know the name or designer? I would be so grateful for any suggestions. I have no other options left of where to search. Many thanks in advance!

Agree with above comments. If you did use a heavy duty lining paper it would need to be applied horizontally but even then you may get problems of the texture showing through, unevenness at the joins where it won’t adhere because of the texture, bubbles or lifting because of the extra layers, and it might make it difficult to remove later on because of the extra adhesive and paint. I would either paint with a trade Matt paint so the texture is not so obvious or strip and re do.

https://janerichardsinteriors.com/collections/moooi-extinct-animals/products/arte-x-moooi-wallcovering-menagerie-of-extinct-animals-wallpaper