I'm not foreign, I'm English.
I've never heard of Exel wines, but they look to be legit.
Their wine list is truly amazing but it looks as if they don't stock all the wines they list.
There are somel internet sellers who don't hold stocks but source from others when they get orders.
THere's an old (2010) thread on the UK wine forum from some individul who sold wines to them and got paid promptly, but another who was having delay in getting a wine order delivered to him.
As I say, I have no personal knowledge of this business.
I have bought wines from Edinburgh based 'Great Grog' wines and can recommend them
http://www.greatgrog.co.uk/Also Majestic is a reliable national chain I can recommend with three shops in Glasgow and they deliver free from their nearest shop -
https://www.majestic.co.uk/stores/Scotland.