Hi Westlake,
I'm an HR Business Partner so hope I can offer some thoughts. I think you'd be in a good position to move into HR as it would be great to have the accountancy background you describe - very strong combination. I think over time it could lead you to manage resourcing departments rather than just HR, if you wished.
You need to consider what sort of HR appeals to you eg Organisation Development, Training, Employment Relations, Reward, Strategy. The typical routes into these involve getting the CIPD qualifications - have you looked at their web-site www.cipd.co.uk.
You can study full or part-time and (in my experience) it is not too academically demanding but you do have to put effort into certain topics. You also get opportunities to practise relevant skills and this would be useful if you haven't done much as yet (eg interviewing, giving presentations etc)
The Diploma courses are quite widely available.
other routes could be an MA - you'd have to see what's available in your area, although I think some moduales/quals are available by distance learning. There are MAs which focus on particular areas of HR so as mentioned above, you need to know what interests you. Some MBAs also give an option to focus on HR.
Many HR departments are divided into the following areas;
Payroll and administration
Reward and HR Strategy
OD
Business Partners
I think you'll find career advice on the web-site I've given - ther's certainly a lot of recent activity in the HR press about career maps and routes. The CIPD is based in Wimbledon if you're anywhere near there - you could ask to see someone.