As long as the school of pharmacy is accredited by the General Pharmaceutical Council it doesn't matter which school you attend. It's all about who you are as a person, how you communicate in the interview, and what you have achieved whilst at university (not necessarily related to your degree class either).
At the BPSA Annual Conference last week there were key members of the hospital and community pharmacy sectors and they said they didn't care which school of pharmacy you attended and rarely looked at the degree class - it's all about you as a person.