Assume it is (male pattern baldness) until you get a proper physical confirmation. Do this at your earliest convenience. Nizoral (prescription strength) can help mitigate itch. Some tar or zinc based otc shampoos offer some relief. Allow all shampoos to set for at least 5 minutes before thorough rinse. Best of luck.
It's not *necessarily* related - I had very similar symptoms as you (scalp dermatitis) and was advised to use Nizoral as a kid - obviously before my male pattern baldness started showing. Though, that said I've always wondered if scalp inflammation / irritation has contributed to and exacerbated the male pattern baldness anyway.
Anyway as ID said above, I'd get on the Nizoral which (as I see you're UK based too) you can get from all the main supermarkets, Boots, Superdrug etc for about £6. When I had a flare up I always had success combining this with the T-Gel range which you can get from the same places. The 'Theraputic' coal tar one especially - yes it really does smell like creosote fence paint (though I quite like it) when you put it on but it washes off fine with no residual smell.
Good luck!