Chiff Chaff or Willow Warbler?

Another blipper had this dilemma recently and now I've got it:-) These two birds are so similar in appearance that it's really hard to tell which is which, especially when they are young, as I think this one is!

I think it's a chiff chaff, but I'm happy to be corrected if you know better:-)

A busy day today with grass cutting (again! - It's all that rain!), housework, two lots of washing and the compilation of a new photobook. The latter took by far the longest to do, but was also the most enjoyable:-) I'll look forward to having a permanent record of our recent Rhine cruise.