Hi Gareth
I could be wrong but it sounds like the thin "tseep" call of a Robin. Listen to the recording below.
Play this audio clip
johannes buhl, XC338111. Accessible at www.xeno-canto.org/338111.
Monkeycheese our resident Robin whisperer hopefully will be along to see what he thinks.
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Tony
My Flickr Photostream
I’d heard the very same sounding ‘tseep’ call many time in the garden and was surprised to find that it was actually a Blackbird making the call. Since then I’ve heard and seen many Blackbirds making the same ‘tseep’ type of call heard on your recording.
My bird photos HERE
Paul could be right. I've heard Blackbirds doing that too but had forgotten. I found this recording which also has a Chiffchaff and other birds in the background as well.
David Bissett, XC361206. Accessible at www.xeno-canto.org/361206
Thanks Tony and Paul, we have got a lot of blackbirds here!!! I'll try and spot them tomorrow.
Thanks
Gareth