legal – Lawyers specialized in visa denial – United Kingdom (Scotland ideally)

This can be a duplicate question; however, I can not find a similar one. I look for advice on the right lawyer for my partner after his visa to visit the United Kingdom was rejected.

I have already been in contact with Drummond Miller and the Immigration Advisory Service, although they do approve rejected visas. I was wondering if there are better options. My partner is a Syrian citizen based in the United Arab Emirates and the Citizens Advice Bureau specified that if we seek legal assistance, we should try to find one that has a background with Syrian citizens and has rejected visas.

Any help on this would be much appreciated, apologize again if this is a duplicate.