The COS Team


Karen Garrattley

Managing Director

Karen is our MD and she started the business back in 1991. When she's not playing her guitar and producing shows she's following up leads, trying new accounting packages, and developing the business.

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Diane Middleton

Financial Director

Diane is our Financial Director. She also teaches a number of our Xero courses and webinars. When she's not at work she loves nothing more than a nice walk in the countryside.

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Ann Lavelle

Consultant and Management Accountant

Consultant, trainer, bookkeeper: Ann is a big part of our team and a support to our support team. She’s also a huge Barry Manilow fan and has even met the pop legend himself!

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Steph Boyle

Head of Client Support

Steph is head of our client support. If she can't provide the answer, she connects clients with team members who can. When she's not busy bookkeeping, she's spending quality time with her son, fiance and their dogs.

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Becky Vanden

Office and Digital Marketing Manager

Becky has a variety of responsibilities at COS. Whether that be writing content or planning events; no two days are the same. In her spare time she goes to conventions and enjoys writing.

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Sean Corker


Sean is a part of our support team and has several years’ experience with Xero. In his spare time he enjoys playing lead guitar in his band.

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Ben Godfrey


Ben is part of both our support and debt collection team and he’s currently studying for his AAT. When he’s not at his desk he enjoys playing a variety of sports.

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Tasnim Yusuf

Bookkeeper and Head of Credit Control

Tasnim is part of our support team but she is also head of our credit control department. She can use both Quickbooks online and Xero. In her spare time she’s loves a bit of Zumba.

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Mike Kielty

Bookkeeper and Management Accountant

Mike is both a Management Accountant and a Bookkeeper. He has experience with a range of software. When he’s not at COS he enjoys fishing and motorbiking.

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Margaret Dalton


Margaret assists both our Xero and Quickbooks online clients in her role on the support team. When she's not at her desk she enjoys cricket and spending time with her Grandchildren.

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Win Edmondson


Win is part of our support team and when she's not helping clients, she's watching Manchester United and working on her golf stroke.

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Bekah Murray


Bekah is an experienced Accountant and provides support to our support team with complex jobs such as VAT returns and management accounts. She has a passion for music and singing and expresses that through her hobbies.

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