I have a Howarth S5 oboe for sale - it has fully automatic octaves and has a thumbplate that can be taken off - the fingering system is dual, Gillet and Thumbplate so the oboe plays beautifully even without the thumb plate. £2,000 or near offer.
I also have a Gordet cor anglais for sale - it was (we believe) in the 1950's. It has a big, dark sound. I bought it from Howarth in London about 8 years ago. I've removed the thumbplate because I prefer to play it without. The thumbplate can easily be re-fitted. £1,800 or near offer.
Please contact me if you are interested and have more questions.