Hey Rich, nice to see you getting stuck into this so quickly... Must get back on to mine now Christmas has past and the freeze appears to have left us.....
Blimey that does look a bit rough... What's been used to try and seal it on the old pipework? Looks like lard!
Is there any damage to the block or is that just crud we can see in your pics.
Keep at it mate, shouldn't be long before you'll be grunting up and down the carriageways.

Shaun