You've got tons of choices.
CWC G10. Stainless steel 36mm by 42, quartz, acrylic crystal, Swiss made, 50m of wr (CWC also make what they call the G22, which is the same watch but boosted to 200m wr) yours for £279, so well within budget. The best bit? It was actually issued. Its not a reissue, it is the exact watch the MOD ordered.
Or there's this, the khaki pilot pioneer, £750 rrp but you can get it for well under. Yes I know it says pilots watch but it was a general service piece issued to all three branches of His majesties armed forces. 36mm by 43 (but it wears significantly larger due to the cushion case). Also Swiss made powered by the H50 (so 80 hours of power reserve) 10 bar wr, and a GORGEOUS textured dial. If fauxtina ain't your bag, CWC make one that looks slightly different.
Or there's the default answer of Hamilton Khaki Field Mechanical.
All of these are way under budget (you could buy 10 G10s and still have change)
Wtf does 'High Horology' mean? Horology is the study of keeping time, and the history of keeping time. A stick in the sand is Horology.
This is the oldest man made time telling device we've ever found. It's a sun dial found in the Valley Of the Kings, thought to be from the 13th Century BC. That's over a Millennium before Christ was born.
You know what else is Horology?
This is Jeff Bezos' 10,000 year clock. It's inside a mountain in West Texas, USA and ticks once a year, and will continue to tick once a year for the next 10,000 years.
Yes, Seiko should be studied by Horologists due to their advancements in time telling ability. The Plutonium Timekeeper buried in Osaka, The first commercial quartz watch, Spring drive (the first major advancement in watchmaking since the aforementioned quartz) and yes, The Seiko 5 for providing high quality (at the time) jewelled movements for the masses, but to call Seiko 'High Horology' is daft and it diminutises how wide the field of Horology actually is.
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