(Corrects spelling of 'sinks' in 4th bullet)
* FTSE 100 up 0.3%, FTSE 250 about flat
* Just Eat jumps after all-share deal with Takeaway.com
* LSE gains on talks to buy Refinitiv
* Sports Direct sinks to lowest since Feb. 2011
July 29 (Reuters) - London's FTSE 100 rose on Monday as talks of a possible deal drove shares of London Stock Exchange higher, along with the shares of Just Eat, which surged following an all-share deal with rival Takeaway.com.
The main index .FTSE added 0.5% and the mid-cap FTSE 250 .FTMC was largely unchanged by 0715 GMT, even after Sports Direct SPD.L tanked after delayed results on Friday showed lower core earnings and a potential tax bill.
Shares of Just Eat JE.L soared 23% to 782.4 pence and hit highest since March after the company agreed to an all-share deal with an implied value of 731 pence a share with rival Takeaway.com TKWY.AS . Stock Exchange LSE.L surged nearly 12% to an all-time high after the company confirmed late on Friday it was in talks to buy financial data analytics provider Refinitiv Holdings for $27 billion, including debt. Reuters TRI.TO , the parent company of Reuters, holds a 45% stake in Refinitiv.
On the mid-cap index, Sports Direct tumbled 17.3% after its delayed results statement showed annual core earnings fell due to problems integrating House of Fraser and as it warned it could face a 674 million euro tax bill from Belgium.