I ordered most of my Japanese knives from JCK here.
Very good service and orders arrived within 7 days.
Price is good even after tax. (no tax incurred for me)
Japanese Chefs Knife
Hattori HD Series:
HD-2 Petty 135mm US$103.00
HD-7 Gyuto 210mm US$172.00
or
Same website
Hiromoto Tenmi-Jyuraku Series (Gingami No.3): (rust proof)
TJ-45G3 Petty 150mm US$72.00
TJ-25G3 Gyuto 210mm US$124.00
or
TJ-20G3 Gyuto 240mm US$145.00
Hiromoto Tenmi-Jyuraku Series (Aogami Super) is the best but then if you are not used to patina then just get the above.Hiromoto AS
With your budget of £180 you will be able to cover for postage and have some spare change.
Anyway have a look at their website.
Ignore everyone else and listen to this^^ Just factor in some money for a shapening stone.
I’ve bought Misono, Fuijiwara and Hiromoto from JCK, all much nicer to use than thick ‘Western’ knives.