Yes, MAN airport seem to allow any amount of Ground Handling Agents (GHA)'s at MAN.
If I am correct it is not a mandatory airport requirement for GHA's to provide at MAN.
Of the GHA's I believe that only Swissport provides to its customers and the other is from Airline Services. (stand to be corrected)
Also the Airlines quite often use a different De-icing supplier to their handling Agent.
Airlines will generally not pay any kind of retainer for de-icing so no incentive for a GHA to provide.
With De-icing rigs costing anything upwards of £300k and De-icing fluid is a time life product and having trained staff on standby.
How can a business case to provide on the basis that it may be required a few days a year.
GHA's have seen their rates driven down over the years by the Airline's and their returns are minimal . Hence minimum staffing and if they do not have to provide a services they will not.
Yes a Central De-icing facility or pad would be great but does MAN have the space and is there a business case to justify it.
Another option would be that ALL GHA's should provide De-icing as part of the Airport Authority approval. At least that way their would be more De-icing rigs available
If no change to current situation then there will be delays at time.