There is no need to engage any specialist to carry out surveying, procedure development, training, re-inspection or auditing. If you have the experience in-house then there is nothing to stop you doing it yourself.
The HSE website is an excellent source of information about the legislation and how you can comply. They also produce a number of excellent publications including the useful HSG 210 Asbestos Essentials – Tasks Manual which is available online here. This manual gives detailed procedures for dealing with common ACMs safely.
Their site is an excellent source of information for proposed changes in legislation.