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Have a look on this site Wingco http://www.taylorsclematis.co.uk/clematis-by-colour/
There are so many variables so it'll be easier if you do the searching as you've got the plant to refer to
It looks to me like Russian Vine - Fallopia baldschuanica, (aka Polygonum balschuanicum, Mile a Minute Vine)
If you put variegated lilac into Google, several sites selling it come up, but they all appear to be in the USA. - here is one
Are you in the UK? Possibly yours was imported?
Our white Hesperis Matronalis is frequently visited by bees and other pollinators.
Also the white campion Silene Alba
Grass carp eat pond plants - that's your culprit!
Looks like a spirea - possibly Anthony Waterer.