I suppose there are two schools of thought here.
Either you and the other residents have established that you want significantly higher speeds & would therefore like to pay extra for some form of upgrade.
If you did that there'd largely be two component charges to this: One would be getting significant enough backhaul to the village, second would then be the cost of whatever equipment is settled upon to share this out; be it WiMAX, some FTTC kit or ADSL2+ equipment in the exchange. I would suggest that if you're dead set on upgrading things that you start by speaking to Rutland telecom. After all if you're going to spend a chunk of cash you might as well get the best for your buck; VDSL at the cabinet would almost certainly be better than ADSL2+ from the exchange. Equally you might like to investigate some sort of FTTP solution, which could offer even higher speeds.
The other thing to investigate is making the best of what you have. For arguments sake, you could consider getting a second phone line with broadband subscription for just the kids, then you and your partner could share the existing. If both lines connect at 8mbit then that should tide you over for now, certainly until any eventual upgrade to 21cn. This approach would certainly require far less capital from yourselves. If neighbours similarly did this the number of broadband lines on the exchange increasing that might make the exchange look more worthy of an upgrade! In the long term, the double line rental and double broadband subs would work out dearer than a single line & FTTC connection though. Also, whether you add a clever load-balancing router in order to link the two connections or if you just do it crudely as discussed above is down to you. Can always start crudely and get more elegant if you feel the need.
A solution you could also look into in tandem with the above would be a decent router with a capable QOS module in it. I've got a Netgear 3700v1 (~£50 off a popular auction website) which I've flashed with the Gargoyle custom firmware. The QOS settings in that are superb; for want of an hour of really considering your settings and getting it right, you could quite easily share the available bandwidth in a far wiser fashion, such that bulk transfers are slowed down and real time services get what they need. This assumes that the sum total of all the real-time requirements is below 8mbit. Certainly it's possible to slow down the bulk game downloads but keep the gaming pings low for a console. Or guarantee a minimum amount of bandwidth to a computer (to ensure Spotify remains stutter free) but provide little more extra. If you want to investigate this avenue further I'd be happy to advise you; I've got a 8-9mbit connection which has similarly heavy demands placed on it by me and my partner; since getting the QOS set nicely it's a world apart.
There's certainly a lot to consider. Hopefully I've given you some food for thought!