Yes, the impossible task, not comparing and contrasting their progress. I don't know if we're 'lucky' but if one seems good at one thing, the other excels in something else - it didn't feel that way so much earlier on though as J was always much more advanced with learning to speak than her sister.
The play tunnel is an excellent suggestion for a 'next level' toy Cerub. We got one from Ikea and it can be packed away when not in use - we've had ours over a year and they still love it - now their favourite activity is to sit astride it with a pair of oven gloves spread wide and pretend they're going on an aeroplane, with one of them wearing my scuba goggles and the other a pair of rainbow sunglasses

Lots of excellent and wise advice there Cerub - thank you. It's a funny one with DH, he really does try his hardest in lots of ways but is about as practical as the proverbial choco teapot. He is just such a ditherer, and whereas I'm storming about the place throwing things in the nappy bag, dressing two children, clearing up, drying my hair, and just getting ON with it... he'll be sitting on the bed staring at his socks and wondering whether they match. Or he'll decide at the 11th hour that the appropriate way to help is to blow up the tires on the buggy and then he can't find the pump, and then blah blah blah. He's a loon basically
He's always been good at certain things - eg. he's never minded getting up in the night for them and in fact has much more patience to deal with night wakings than me. Even when he's working his socks off, he's never complained about having to get up for them. But during the day, it's as though my 'competence' (I use the term loosely) makes him feel inadequate or something and so he backs off and doesn't do anything. We definitely have to address it though, not least because it's not making me happy.
Am half sorry but also glad to hear you've been signed off work again. Are you feeling better at all? I think it's very difficult to 'let go' of standards we've set for ourselves our whole lives, and of course before we had kids we had much more jurisdiction over our ability to deliver on certain things. There is a loss of control and I think it can be unnerving for people who are very organised in the first place. Sadly I don't think I've ever been described thus 
PS: I've just started saying "yes, actually it IS sometimes" when people ask me if it's hard work having twins whereas before I would always be a bit defensive and sing the praises of having them. Had a lovely moment yesterday though when I was pushing our buggy along and saw a mum with a twin buggy obviously containing newborns (she was holding one of them while granny pushed) and we looked at each other and smiled knowingly. I love that unspoken bond between twin mums, that kind of 'yes, I KNOW, it's hard isn't it, but it's also bloody brilliant and aren't we lucky?' :)
ALL - agree you do sound relaxed about it all. Pass some my way please! Camping trip sounds wonderful.
LVB - yy to Army Museum although am busy weekend of 8th/9th. For once! Weekend after works though?