Bird Song ID

If it's any help, the Merlin Bird ID smartphone app has a useful Sound ID function. It got song thrush for your main offender, which I can believe once tuned in to the repetitions. It also flagged nuthatch near the beginning, which I'm less sure about -- sounded like a ticking robin to me, but I'm sure others can judge better than me.

Funny time of year for thrush song -- is it a recent recording? And bear in mind that bird ID suggestions from this app are geographically selected, though shouldn't make too much difference unless you're in Timbuktu?

It was recorded yesterday, and in England

Sounds like a Parakeet to me.

Ring-Necked Parakeet seem to be building up colonies throughout the uk mainly to the detriment of other species.