diff --git a/ethcore/light/src/client/mod.rs b/ethcore/light/src/client/mod.rs
index e97d92589..0ea8983b9 100644
--- a/ethcore/light/src/client/mod.rs
+++ b/ethcore/light/src/client/mod.rs
@@ -207,7 +207,7 @@ impl<T: ChainDataFetcher> Client<T> {
 
 	/// Import a header to the queue for additional verification.
 	pub fn import_header(&self, header: Header) -> EthcoreResult<H256> {
-		self.queue.import(header).map_err(Into::into)
+		self.queue.import(header).map_err(|(_, e)| e)
 	}
 
 	/// Inquire about the status of a given header.
diff --git a/ethcore/src/client/client.rs b/ethcore/src/client/client.rs
index 0d3fb0781..a5a5a149e 100644
--- a/ethcore/src/client/client.rs
+++ b/ethcore/src/client/client.rs
@@ -1405,15 +1405,14 @@ impl ImportBlock for Client {
 			bail!(EthcoreErrorKind::Block(BlockError::UnknownParent(unverified.parent_hash())));
 		}
 
-		let raw = unverified.bytes.clone();
 		match self.importer.block_queue.import(unverified) {
 			Ok(res) => Ok(res),
 			// we only care about block errors (not import errors)
-			Err(EthcoreError(EthcoreErrorKind::Block(err), _))=> {
-				self.importer.bad_blocks.report(raw, format!("{:?}", err));
+			Err((block, EthcoreError(EthcoreErrorKind::Block(err), _))) => {
+				self.importer.bad_blocks.report(block.bytes, format!("{:?}", err));
 				bail!(EthcoreErrorKind::Block(err))
 			},
-			Err(e) => Err(e),
+			Err((_, e)) => Err(e),
 		}
 	}
 }
diff --git a/ethcore/src/verification/queue/kind.rs b/ethcore/src/verification/queue/kind.rs
index c356d66ff..7d98aa943 100644
--- a/ethcore/src/verification/queue/kind.rs
+++ b/ethcore/src/verification/queue/kind.rs
@@ -58,7 +58,7 @@ pub trait Kind: 'static + Sized + Send + Sync {
 	type Verified: Sized + Send + BlockLike + HeapSizeOf;
 
 	/// Attempt to create the `Unverified` item from the input.
-	fn create(input: Self::Input, engine: &EthEngine, check_seal: bool) -> Result<Self::Unverified, Error>;
+	fn create(input: Self::Input, engine: &EthEngine, check_seal: bool) -> Result<Self::Unverified, (Self::Input, Error)>;
 
 	/// Attempt to verify the `Unverified` item using the given engine.
 	fn verify(unverified: Self::Unverified, engine: &EthEngine, check_seal: bool) -> Result<Self::Verified, Error>;
@@ -86,16 +86,16 @@ pub mod blocks {
 		type Unverified = Unverified;
 		type Verified = PreverifiedBlock;
 
-		fn create(input: Self::Input, engine: &EthEngine, check_seal: bool) -> Result<Self::Unverified, Error> {
+		fn create(input: Self::Input, engine: &EthEngine, check_seal: bool) -> Result<Self::Unverified, (Self::Input, Error)> {
 			match verify_block_basic(&input, engine, check_seal) {
 				Ok(()) => Ok(input),
 				Err(Error(ErrorKind::Block(BlockError::TemporarilyInvalid(oob)), _)) => {
 					debug!(target: "client", "Block received too early {}: {:?}", input.hash(), oob);
-					Err(BlockError::TemporarilyInvalid(oob).into())
+					Err((input, BlockError::TemporarilyInvalid(oob).into()))
 				},
 				Err(e) => {
 					warn!(target: "client", "Stage 1 block verification failed for {}: {:?}", input.hash(), e);
-					Err(e)
+					Err((input, e))
 				}
 			}
 		}
@@ -209,8 +209,11 @@ pub mod headers {
 		type Unverified = Header;
 		type Verified = Header;
 
-		fn create(input: Self::Input, engine: &EthEngine, _check_seal: bool) -> Result<Self::Unverified, Error> {
-			verify_header_params(&input, engine, true).map(|_| input)
+		fn create(input: Self::Input, engine: &EthEngine, _check_seal: bool) -> Result<Self::Unverified, (Self::Input, Error)> {
+			match verify_header_params(&input, engine, true) {
+				Ok(_) => Ok(input),
+				Err(err) => Err((input, err))
+			}
 		}
 
 		fn verify(unverified: Self::Unverified, engine: &EthEngine, check_seal: bool) -> Result<Self::Verified, Error> {
diff --git a/ethcore/src/verification/queue/mod.rs b/ethcore/src/verification/queue/mod.rs
index 2d5f50c5d..9b1597439 100644
--- a/ethcore/src/verification/queue/mod.rs
+++ b/ethcore/src/verification/queue/mod.rs
@@ -26,7 +26,7 @@ use heapsize::HeapSizeOf;
 use ethereum_types::{H256, U256};
 use parking_lot::{Condvar, Mutex, RwLock};
 use io::*;
-use error::*;
+use error::{BlockError, ImportErrorKind, ErrorKind, Error};
 use engines::EthEngine;
 use client::ClientIoMessage;
 
@@ -469,21 +469,21 @@ impl<K: Kind> VerificationQueue<K> {
 	}
 
 	/// Add a block to the queue.
-	pub fn import(&self, input: K::Input) -> EthcoreResult<H256> {
+	pub fn import(&self, input: K::Input) -> Result<H256, (K::Input, Error)> {
 		let hash = input.hash();
 		{
 			if self.processing.read().contains_key(&hash) {
-				bail!(ErrorKind::Import(ImportErrorKind::AlreadyQueued));
+				bail!((input, ErrorKind::Import(ImportErrorKind::AlreadyQueued).into()));
 			}
 
 			let mut bad = self.verification.bad.lock();
 			if bad.contains(&hash) {
-				bail!(ErrorKind::Import(ImportErrorKind::KnownBad));
+				bail!((input, ErrorKind::Import(ImportErrorKind::KnownBad).into()));
 			}
 
 			if bad.contains(&input.parent_hash()) {
 				bad.insert(hash);
-				bail!(ErrorKind::Import(ImportErrorKind::KnownBad));
+				bail!((input, ErrorKind::Import(ImportErrorKind::KnownBad).into()));
 			}
 		}
 
@@ -500,7 +500,7 @@ impl<K: Kind> VerificationQueue<K> {
 				self.more_to_verify.notify_all();
 				Ok(hash)
 			},
-			Err(err) => {
+			Err((input, err)) => {
 				match err {
 					// Don't mark future blocks as bad.
 					Error(ErrorKind::Block(BlockError::TemporarilyInvalid(_)), _) => {},
@@ -508,7 +508,7 @@ impl<K: Kind> VerificationQueue<K> {
 						self.verification.bad.lock().insert(hash);
 					}
 				}
-				Err(err)
+				Err((input, err))
 			}
 		}
 	}
@@ -784,7 +784,7 @@ mod tests {
 
 		let duplicate_import = queue.import(new_unverified(get_good_dummy_block()));
 		match duplicate_import {
-			Err(e) => {
+			Err((_, e)) => {
 				match e {
 					Error(ErrorKind::Import(ImportErrorKind::AlreadyQueued), _) => {},
 					_ => { panic!("must return AlreadyQueued error"); }