Thanks everyone

To be honest, I don't think I'd have thought twice about it if Dave hadn't changed a bit recently. He's generally ok in the house but over the past 2-3 months on walks, I think if I was Normy I'd have killed him by now
He has long episodes of yapping and yapping and jumping up biting her face/ears etc and chasing her everywhere - there hasn't been any real aggression with her to date, just very rude irritating behaviour iyswim but he's an angel when he's walked on his own

. Although having said that, he's also been a wotsit with some other dogs to the point it wasn't acceptable and I've had to remove him

. I think generally because they are so opposite in everyway possible and that Norms is the calmer one of the two within their relationship, they do have every chance of it being ok - she tends to just ignore him or block him with her body and he does seem to be improving in the last couple of weeks so I'm hoping it's just a bit of an adjustment period for him. It probably wont be until May/June time that we need to split them up so hopefully he'll have settled by then.