Another question for you fab pedants:-)

[belgo]

What's the difference between specialized and specializing?

anyone please?

I think it would just depend what you're describing - you might be a "specialized service" or a "service specializing in X"

Yup. Specialised is an adjective and specializing is a verb (or perhaps also used as an abverb? Mmm... too long since I did English grammar at school).

I think I need specializing as it is specializing in ...
thank you!

specialised =adjective
specialising= present participle of verb here used as an adjective ie describing the service. (you could for example, substitute specialising in with "which specialises in...")

Can we have specialising, please; not specializing.