If you mean they've split (photo would be good) and then have sort of corky areas where the splits happened, this is fruit split caused by irregular water supply - just means the tree didn't have enough water when the fruits were trying to grow, then, when water arrives, they swell rapidly, and the skin splits.

Your pear tree has had very dry times and when wet it is very wet receiving strong nitrogen. Make the most of the fruit you cannot repair, (cooking etc.). With the cracked branches, wrap them in sealglaze tape to keep the bark soft and the cracks will heal quickly that way. Take the tape off when frosts have finished next year.

Bamboo/ Dr Bob... ...
I noticed pear photo has been added to GoY photos...

Yup, thanks TT - been and had a look. Definitely Fruit Split, as I said above.

Thankyou for the responses I'm fairly new to gardening so Iam grateful for any and all info and advice Thanks again
Blortwick