Thanks Paul, after googling and reading up (and posting the same question on TalkBass) I've come to the conclusion that Prestos are my best bet and the good news is I already have them, so no need to spend any money!
Rattlin Bone going well thanks - we did a mini-tour of Portugal, got played on BBC Radio a few weeks back and have a couple of festival dates upcoming (Meadowlands, Upton Blues).
Not really sure I could give you any notes as I really am a total beginner on DB - thankfully RB's bass lines are incredibly simple and repetitive. Would love to have a lesson from you in how to slap some time in return for alcohol/monetary inducement!