(2-part post):
Since Ryanair withdrew all flights from the UK to Charleroi, you're not left with a lot of choice. However, it's not impossible to get from north-west England to Belgium:
VLM operate from Manchester to Antwerp:
http://www.flyvlm.com/emc.asp
Typical flight prices, excluding taxes and charges are �29 each way on direct flights or �39 each way via London City airport.
VLM will also fly you Brussels via London City, with fares starting from �29. However, FlyBe operate a direct service from Manchester to Brussels:
http://www.flybe.com/
For the sample dates I've just looked at, most fares are �38.36 (excluding taxes and charges) each way. However, there are some flights at �8.86, while a few are �80.36.
For transport connections from Antwerp airport, see here:
http://www.antwerp-airport.be/contentpage_en.p hp?p=openbaar_vervoer
From Brussels airport, see here:
http://www.brusselsairport.be/en/parking_trans port/toandfrom/