Here are a few links to resources for others who are also trying to collect debts from businesses or individuals residing in the UK.

Business Debt Collection & Recovery Solicitors | The Thomas Higgins Partnership
“We understand how important it is to get your invoices paid as soon as possible, so we have made it quick and easy to instruct us. Once we are on the case we have dedicated and enthusiastic staff and highly efficient processes in place, so we can take the burden off you and work towards a speedy and satisfactory conclusion.”
Debt Recovery Solicitors - Stephensons Solicitors LLP
“Here at Stephensons, we provide a business debt recovery service that is simple, effective and fast. We have specifically developed our commercial debt recovery service to deal with invoice debts, which means that, when payment problems arise for your business, our team of debt recovery solicitors can focus on recovering your debts on a low cost, fixed fee basis.”
Debt Recovery Solicitors ¦ Lawyers in London & Richmond, Surrey  | Fisher Meredith
“Fisher Meredith is an award winning London law firm with offices in Richmond, Surrey and Kennington, London. Our commercial debt recovery solicitors have an outstanding reputation for acting on behalf of individuals, businesses and organisations with highly successful results.”
Harley Legal & Collections Ltd
“Harley Legal & Collection Ltd are a firm of highly trained debt collectors, solicitors and bailiffs based in Harley Street London.”
Lane & Co.
“At Lane & Co we specialise in debt recovery and litigation and we do not offer any other services we prefer to concentrate on what we know and what we do best. Based on its dedicated approach, the firm has grown over the years with the addition of widely experienced staff who offer advice when our clients most need it. Lane & Co is now recognized as a major force in the debt recovery field.”
Lovetts PLC | Debt Recovery Solicitors
“Our Legal Claims service helps the credit manager take cost-effective steps to recover late payment debt, with costs, interest and compensation. Judgments can be enforced in multiple ways, or insolvency proceedings commenced with or without a Judgment.”