Kitchen mixer tap - help please.

[wilfandrowlf]

The small plastic "flow straightener" bit on my kitchen tap gave up this morning and shot off the end and in to the sink!
Does anybody know if they are available as a spare part?
I don't want to replace the whole tap as it perfectly OK otherwise.
I'm not actually sure what they are called to be honest and a quick Google search proved unsuccessful.

I took these pics if it helps.......






Thanks.

[wilfandrowlf]

Thanks Bomma220, great link, I've ordered the bits that should do the job.
Cheers