The Vitality Liverpool Half Marathon is organised by BTR who organise other successful races such as the Port Sunlight 10k in May and the Tunnel 10k in June. The start and finish has been moved to a World Heritage Site and now the Liver Birds overlook proceedings. I'm a little biased as I'm from Liverpool but this is a great race in a fabulous city!
A predominanly flat course where you could definitely get that pb. The only incline occurs as you run up Upper Parliament Street early on at around the 1 mile mark. From there runners make their way around the magnificent Victorian Sefton Park before reaching the prom and a pancake flat four miles to the finish - you'll fly as long as the wind is behind you.