If the ewe is pawing the ground and panting it sounds as though she is getting ready for the next arrival.
Try and give her a bit of space to get on and do what she nees to do, i.e. don't start to intervene unless you think there is a problem. Normally the second one will come fairly soon afterwards but I have had GFDs where it has taken up to a couple of hours. Certainly don't start trimming away at this stage - there will be plenty of time for that after the lambs have bonded with Mum.
If the first lamb isn't suckling make sure you get colostrum (not milk) into it. Ideally within the first hour. At least it looks as though the lamb is trying to do the right thing. GFD lambs can be pretty gormless and having a shearling as a Mum can sometimes add to the fun and games. Once Mum has had her second lamb and has bonded with both lambs you can spend time trying to get the lambs latched on.
Once you have cleared the waxy plugs, make sure the colostrum is coming through OK.
Regarding the Heptavac P - you mention a 'second' booster - have you already given the ewes a booster this year? Other than the first year when the lambs get 2 doses, in subsequent years they only need one dose.
Let us know how you get on. Good luck!!
