Mostly, this covers similar ground to any other anthology of English language poetry. It covers over 400 years of poetry from the Tudors to Dylan Thomas, in almost 500 pages - so pretty much every well known poet who wrote in modern English should be represented.
But...there some distinctly sexist aspects to the selection and arrangement of the chosen verses. The first woman poet doesn't appear until almost two hundred pages in: this might be due partly to the higher barriers for women to become published poets, so could be excusable.
However, the weird thing about how the poems are organised is that male poets are designated with surname only, as though "Chapman" or "Sidney" would be enough to provoke recognition in the reader, but women poets are given full names, which has the effect of making their poetry seem almost alien. This is especially strange with "Rossetti" and "Christina Rossetti", which just looks weird. The layout leaves plenty of space for every poet to have their full name provided, and it would actually be helpful to the reader because they don't need to go to the list at the front of the book to remind themselves who a particular poet is.