I don't have an axe to grind on this, but I would tend to agree with the opinions from the lawyers in this thread. I always say to new clients that I hope that their partnership agreements will be a waste of money. In a successful amicable partnership, you will have drawn up the agreement at inception and put it away in a drawer and hopefully it will never see the light of day again as everything will be done by agreement.
It's when partners fall out and they either don't have an agreement in the drawer or it is inadequate that problems really start. I have a client who at the moment is exactly in that position. He joined a partnership in 1970 and although there is a partnership agreement, the provisions relating to dissolution are incomplete. Both sides have taken counsel's opinion and the legal and accountancy fees are already in five figures. The next step appears to be consideration of an application to the court for dissolution in accordance with the Partnership Act 1890. Allegedly, jointly, they are making provision for legal expenses up to £100K and the business is only worth about that amount but they are stuck on a point of principle.
If the cost of a partnership agreement is prohibitive, you may well need to reconsider your buisness plan or accept that problems may arise in the future