Well N15SAN you are not alone here, This is the exact same reaction (or lack of one) I had when I tried enquiring about a vehicle HJA had for sale on their website last year. I'd also read some very good things about this company on the old interweb but I never got to speak to anyone in person. The phone numbers I rang just didn't get a response. Email was the only contact I had but replies from HJA took what seemed like forever back then.I suppose I persevere and try again today. Yes I've tried emailing them through the website also but to no avail.
I know exactly how you feel N15SAN, frustrated is truly an understatement. Communication is an area which definitely could be improved IMHO!His Facebook page is updated frequently so I sent him a PM on there which prompted a response and a request to contact him via the HJA sales address. I sent him a further 2 emails which so far haven't been responded to. I messaged him on Facebook to ask whether or not he received my emails, to which he confirmed that he had and would reply soon. "Soon" to me would be same day but alas, no reply. Seems a nice bloke, probably just really busy.