injector pump leaking HELP

my injector pump on a Defender 200tdi started heavy drips this morning.
Cleaned up the pump. looks to be leaking from the seam were the injector pipe(s) block joins the main body. now in looking at it, i would imagine there is a gasket there, that has failed.

Can anyone confirm or deny my hunch and if there is a gasket kit for that, and of course, is it a DIY level of repair.
still runs fine, no smoke. drips only when running.


Advice, or suggestions.
regards
Mark
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Can you post a picture, as you are referring to a 'seam', and things tend not to be attached to seams!

Is it the joint between the block and the body which is leaking?

Sorry, but this is where I find that your Merkin English and proper English English are somewhat different!