A Gillott badge went on E-bay for £21 ten days ago on E-bay.
You can buy a Gillott frame (requiring renovation), including badge, for not much over £100.
A renovated Gillott frame including badge for £150 plus if you are patient.
Happy to up my offer to £20. But there isn't much enthusiasm or copper left in the kitty after that I am afraid.
If you are wanting £50........ Ebay "buy it now" might be a better option.
Alternatively post on here to sell for £50 and see how it goes.