Search Engine Marketing / Google Adwords

We are a small UK B2B company.We have been using Google Adwords for 8 years and our account contains around 1200 keywords in 11 Campaigns with numerous Ad Groups. We have been running the Account ourselves and believe it will benefit from an expert third-party optimisation. However, we are nervous about letting someone outside the business have access to the Account ! So you must demonstrate a high level of trustworthiness. You must also be experienced in DKI which we use extensively.