I would be using this for lite P2P usage, web browsing, VPN, Hosting some development servers. Nothing excessive imo.
That doesn't affect the Ellacoya shaping at the Plusnet end though does it! Nor the Centrals/MSIL provision and capacity.
Central capacity is the reason for Plusnet traffic-shaping. Nothing else. FTTC wil not, in itself, affect that. But FTTC will increase the speed demands between the exchange, the MSILs and the Plusnet servers, so isn't a pleasant thought wrt traffic shaping and/or congestion.
People on FTTC will expect miracle speeds.