Unknown tree - back of leaf (same leave as picture 3)

Unknown tree - back of leaf (same leave as picture 3)

Observation - Unknown tree - back of leaf (same leave as picture 3). Description: This is a tree in my back garden - just moved in and trying to identify it so I can look after it. Any suggestions welcome. On Facebook, people have said Linden/Lime, but am not sure. Thanks.

This is a tree in my back garden - just moved in and trying to identify it so I can look after it. Any suggestions welcome. On Facebook, people have said Linden/Lime, but am not sure. Thanks.