Bangladesh's Australian coach Jamie Siddons believes England will need to find an extra dimension to retain the Ashes this winter.

England on Sunday completed an emphatic 2-0 series win over Siddons' side by wrapping up an innings and 80-run victory in the second npower Test at Old Trafford.

England's performances this summer will be used as a yardstick for their upcoming Australia tour and while Siddons does not doubt their quality after last year's home Ashes win, conditions Down Under will be different.

Siddons said: "They are obviously good enough to win, they have just beaten Australia, but I made a throwaway comment that 'it doesn't swing, it doesn't seam in Australia', and it certainly won't swing like it did here (in England).

"You need to put it in good areas and maybe get it up a bit fuller because short stuff isn't going to worry Australia.

"They are good enough definitely. They have the batsmen to make enough runs and a good off-spinner for days four and five."

England beat Bangladesh with a four-man bowling attack comprising three seamers and off-spinner Graeme Swann.

They fielded six batsman with wicketkeeper Matt Prior coming in at number seven.

Siddons is not convinced they have the balance right or if another bowler should come in.

The former South Australia batsman added: "I'm not sure about the composition of their team, you have to make enough runs to give your bowlers a chance.

"It's a balancing act like in Test cricket here.

"Each wicket in Australia is different - Adelaide will spin a lot more and take it earlier, Brisbane probably won't take any at all until the last day or two."

Bangladesh were competitive for spells in both Tests against England but were ultimately outclassed.

They enjoyed a strong spell on the second day in Manchester as they finished off England's innings for 419 and then made a thunderous start in reply.

Tamim Iqbal blasted a thrilling century but the team then capitulated disastrously twice.

They lost all 10 first-innings wickets in the final session on Saturday and were then bowled out for a second time in the first on Sunday.

Siddons said: "If things had gone our way we could have knocked them over for a bit less, then it's up to our batsmen.

"We have two or three who can do that but the others need to catch up. We are still on a learning curve."

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