EMYR Lewis has warned Exeter  Chiefs’ unbeaten record will go at  Bristol unless they cut out their  mistakes.

The full-back was delighted to  beat former employers Plymouth  Albion 30-24 on Saturday.

But he felt his side made too  many errors — including giving  away an interception try — as  they made life easy for Plymouth.

Exeter travel to Bristol on Sunday as two of the three Championship sides yet to taste defeat  this term go head-to-head.

And Lewis thinks the Chiefs  will be the ones whose run comes  to an end unless they sharpen up  their act this week.

“It’s always satisfying when  you get one over your old team,”  said Lewis. “We’re chuffed with  the result.

“It’s a pity we gave the bonus  point away, but at this stage of the  season a ‘W’ is a good start.

“It’s a huge South West derby  and it’s always a tough game.  When I came up here with Plymouth Exeter were in good form  but they only won 11-10 — form  goes out the window in games like  this.

“When you give tries away with  a 70-metre interception, the team  are going to get their heads up and  confidence goes through the  team.

“We’ve got to cut that stuff out  of our game if we want to beat the  Bristols of this world — we can’t  give the opposition chances like  that.”

After racing into an early lead  courtesy of Paul McKenzie’s try,  Exeter had to twice come from  behind in the second half to win.

Replacements Rich Baxter and  Bryan Rennie scored the tries  that mattered and Lewis said the  side showed their character to  win their seventh Devon derby in  a row.

“It shows the character and it’s  a win,” he said. “At this moment  in time we’re going for wins and if  the bonus point comes then so  much the better.

“We’ve come off the field having  won a South West derby and  we’ve got to be happy with that.”

Lewis said the impact the replacements made on Saturday  highlighted the depth of talent in  Exeter’s squad.

After just four games this season, 30 players have featured in  the matchday squad as head  coach Rob Baxter rotates his personnel.

Lewis said: “We’re a strong  squad of players, there are 36  players capable of starting in this  side every week.

“Rob (Baxter) knows that and  he’s willing to give guys a chance  in certain positions.

“You could put two teams from  Exeter out on the pitch and I  wouldn’t be able to tell you what  the score would be.

“That goes right through the  squad, the character’s there,  we’re a close-knit bunch of boys  and we work hard for each other.”