Those grading from the UK but using a US grading service (like PSA, BGS or CGC) will generally find it easier to grade using a middleman as they can deal with the international shipping and the customs charges. UK-based companies likeTrustGradingandDan’s Pokestopare very reputable for this...
CGC is a subsidiary of Certified Collectibles Group, which provides grading services for coins and sports cards. Located in Florida, CGC, which claims to grade over 100,000 comic books annually, is unique among grading services because it doesn't allow its employees to commercially buy or sell...