gold sovereigns are very very valuable coins. but in george v series jewellers strike is very common.just check for genuineness in" coins of uk "website also look for the prices in the same website.
generally these coins sell in the uk for around £200, but beware there are some counterfeits from this year for soveri eign and half sovereign.
And even then, you couldn't be 100%. Having said that, I don't see anything to give cause for concern from the photo...