Tapash Baisya kept the hosts quiet with four wickets in the last three overs.
Botha has taken just four wickets in his two Test appearances, but Nel may feel more unfortunate.
Tahir, 30, who has 382 first-class wickets, will be the Bears' overseas player for 2010.
The 22-year-old took the first four wickets to fall before Blackwell pinned Samit Patel lbw 122-5.
He played in the last three matches of England's 3-1 series win, claiming 17 wickets.
Edwards got England off to a steady start but her side lost wickets at regular intervals.
They won by seven wickets with an over to spare, Ross Taylor unbeaten on 21.
Boyd Rankin and Regan West both claimed two dismissals while the other wickets were shared out.
Left-arm spinner Ant Botha and seamer Tom Lungley shared the bowling honours, taking four wickets each.
It's important now to back the score that we've got and get the other 19 wickets.
"We just wanted to build pressure and the wickets came our way, " said Broad.
"There's no miracle treatment for me, " added Lee, who has taken 310 wickets in 76 Tests.
There have been no runs and no wickets and Giles dropped a crucial catch.
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Bashar's bowlers picked up wickets at regular intervals on a slow and uneven pitch on Wednesday.
The tourists knocked off the runs in 41 overs for the loss of seven wickets.
Medium pacer Mahmud, who took three of the first four wickets, finished with 3-33 and M.
Earlier, Charl Willoughby took three of the five Lancashire wickets to fall, finishing with 5-109.
We lost too many wickets too softly and that is something you've got to look at.
Only Shane Warne (626) and Muttiah Muralitharan (565), both spinners, have taken more Test wickets.
He has picked up four wickets in the three one-dayers he has played so far.
Warne was also man-of-the-match in the final against Pakistan, when he took another four wickets.
Two wickets fell in two overs before the win was sealed with 68 balls left.
League newcomers Allscott fell to their first defeat, losing by seven wickets to Welshpool.
Pakistan leg-spinner Mushtaq Ahmed has agreed a two-year deal after taking 103 wickets last season.
The tourists took 354 balls to go from 200-300 and lost three wickets for 11.
And there were certainly signs of fatigue in some of the shots that brought wickets.
Across the board, in all formats of the game, spinners are taking more wickets.
Muralitharan then snapped up the wickets of Gambhir (43), Sourav Ganguly, Dinesh Karthik and Anil Kumble.
Khan made his Kent debut in 2002 and took 63 wickets in his maiden season.
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"From the first time we played Twenty20 we've been taking wickets and whacking runs, " says Clarke.
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