!
140-150 Euro sounds like a high normal hire rate in the UK!
Fuel prices are high in most of Europe so the rates you will pay will be based on this and a little for the A/C, insurance, maint. and the operator/owner if they are lucky!
There are a few people/firms in the UK who will get you near block rates to the USA! A couple of them are on this forum and may pipe up with a PM or some advise.
All depends on where you are in the UK and convience! You can get a nice crisp C150 in the NW of England as low as £73.00/hour wet with Vat, this is with no memberships, monthly fees or other price inflators!
Give me a PM if you want the contact details.
I would go where it is convent for you!
JL.