We already have an organisation in the FTSE 100 specifically designed to provide business funding
http://www.3i.com/about3i/key-facts.html For smaller businesses;
http://www.bbaa.org.uk/ We also have EIS schemes, VCTs, 21 new enterprise zones (with tax breaks and infrastructure support), not to mention the £47.2bn in lending to enterprise from the big 5 banks in Q1 alone
The efficiency of this large support network for businesses means that viable companies often find that capital is available when required. By skewing this model to artificially support industries where we have limited or no competitive adavantage we are storing up future problems. When companies consequently fail, the cost of the bad loans and lost investment capital is eventually born by our society as a whole in terms of unemployment, higher costs as lenders recoup losses etc.
If any changes should be made, we should be looking to improve the incentives for investment into starts ups even further, provide tax relief at investor level, remove CGT on enterprise investments from Day 1, thereby encouraging more capital investment but allowing the market to ascertain which businesses to back. That way, if you have a great manufacturing idea, or engineering, or marketing, or software, or catering, or dare I say it financial services (?!) then funding would be even more available.