b15261cc__How_to_identify_UK_amphibians__What_did_you_see_
[Where did you see it?] Very close to or in water. Re-introduced to very secret sites in East Anglia. An extremely lucky spot! [I could be a...] Pool frog (Pelophylax lessonae) [What did you see?] 
Similar to the common frog. Usually brown in colour with dark spots. A light yellow back stripe. Males have prominent vocal sacs at side of mouth.
BBC Nature - How to identify UK amphibians
What did you see?