The office, at 75 Farringdon Road EC1M, will have facilities for 20 sales executives, plus meeting rooms and "hot desks" for other staff.
Sales and marketing director John Ashfield said the location was "ideal" for serving London customers.
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"Gosh! That’s a huge debt - especially HMRC! It’s a shock that HMRC allowed such an amount to be accumulated."
"Whatever happened to the good old fashioned cash job! At least the banks didn't take 2-3% of each sale. After 30 odd transactions that £100 quid you had has gone."
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